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Reef Octopus has been building protein skimmers since before most of today's reef keepers started the hobby. The brand sits at the intersection of serious performance and premium build quality, and for good reason. Their skimmers show up consistently in large, demanding reef systems because they do the job without requiring constant intervention.
This guide covers every Reef Octopus skimmer currently available on Amazon, alongside some worthwhile alternatives for people who want comparable performance at lower price points. Whether you're equipping a 100-gallon mixed reef or a 200-gallon SPS-dominated display, there's a model here suited to your system.
I focused on verified specs, honest ratings context, and real limitations. Some of these skimmers have very few Amazon reviews because serious reef keepers often source them from specialty retailers, not Amazon. Low review counts don't indicate poor products in this category.
Quick Picks
| Skimmer | Best For | Price |
|---|---|---|
| Reef Octopus Classic 100-HOB Bundle | Sumpless reef up to 75 gallons | $337.99 |
| Reef Octopus Classic 150 SSS | Sump systems up to 150 gallons | $384.99 |
| Reef Octopus Regal 150-INT | In-sump performance up to 160 gallons | $658.34 |
| IOAOI 60-90 Gal DC In-Sump | Budget reef alternative | $79.99 |
| IOAOI 110 Gal DC In-Sump | Mid-size alternative to premium brands | $159.99 |
Individual Skimmer Reviews
Reef Octopus OCTO Regal 150 SSS Space Saver Protein Skimmer
The Regal 150 SSS is Reef Octopus's answer to sumps with tight footprint constraints. At 9 x 7.5 inches, it covers up to 210 gallons (light load) while fitting in spaces that exclude many comparable-capacity skimmers.
3 standout features: - VarioS-2S controllable DC pump with 5 power settings for adjustable output matching tank bioload - Space-saving body design at 9 x 7.5 inches for restricted sump sections - Handles up to 210 gallons light load, 160 medium, 100 heavy: real-world flexibility across stocking levels
The controllable DC pump is a significant feature. Being able to back off pump speed during vacation, post-water-change periods, or when reducing bioload gradually keeps skimmate production consistent rather than forcing constant manual adjustment. This is a maturity feature that cheaper skimmers simply don't offer.
At $716.09 and 11 reviews at 5 stars, the sample is small but the price tier filters out casual buyers. The users leaving reviews here are running serious systems. The output height at 9.1 inches and the included British adapter for metric plumbing show the kind of detail-oriented engineering that separates Reef Octopus from budget brands.
Pros: - VarioS DC pump with 5 controllable settings - Space-saving footprint for tight sump installations - Wide tank capacity range with honest bioload scaling
Cons: - Premium price justified only by serious system requirements - Small Amazon review count, though this is normal for the price tier - Requires a sump, not suitable for sumpless systems
Reef Octopus OCTO Regal 150-INT In-Sump Protein Skimmer
The Regal 150-INT is the internal sump version of the same 150-series body, differing from the SSS primarily in its 11.4 x 7.5 inch footprint and the VarioS-2S pump configuration. Same tank coverage ratings: 210 gallons light, 160 medium, 100 heavy.
3 standout features: - Reef Octopus VarioS-2S controllable pinwheel pump with 5 energy-efficient settings - Internal sump placement design for stable water level operation - 6-inch body diameter with 22.6-inch total height for the standard Reef Octopus 150-series reaction chamber
The INT designation means this sits inside your sump with water flowing around it, which generally produces the most stable skimming conditions. Water level in the sump section directly affects foam column height, so a dedicated skimmer section with controlled water level produces the most consistent results.
At $658.34 with 5 reviews at 5 stars, this is slightly less expensive than the SSS version while being effectively equivalent in performance. The choice between SSS and INT comes down entirely to your sump layout.
Pros: - In-sump design with stable operating conditions - VarioS controllable DC pump - 5-star reviews from experienced reefers
Cons: - Larger footprint than the SSS version - Requires specific sump water level management - Higher price tier limits accessibility
Reef Octopus Classic 100-HOB Bundle
The Classic 100-HOB with its bundle extras is the right Reef Octopus skimmer for sumpless reef systems. The included refractometer is actually useful (you need one for any saltwater tank), and the skimmer itself covers 55-105 gallons with the Aquatrance 1000s pump at 9W.
3 standout features: - Adjustable surface skimmer pulls from the water layer where proteins concentrate most heavily - Air silencer reduces the characteristic hissing noise of air-injection skimmers - Low profile body at 8 x 3.25 inch footprint works with rimless tanks without a sump
The surface skimmer adjustment is practically valuable. Most dissolved organics and waste film accumulates at the water surface, so drawing from there rather than mid-column improves skimmate quality and density. This is a thoughtful design feature rather than a marketing addition.
At $337.99 with only 2 reviews, the feedback is limited. But the underlying product (the Classic 100-HOB) has a long track record in the reef community. The bundle packaging from Inland Seas adds the refractometer and a towel, both of which are useful accessories for any reef keeper.
Pros: - Works without a sump, essential for many setups - Adjustable surface skimmer improves organic removal efficiency - Bundle adds real value with a refractometer
Cons: - Limited Amazon review data - 9W pump is modest for the 105-gallon maximum claim - HOB designs are inherently less stable than in-sump at equal bioloads
Reef Octopus Classic 150 Space Saver Protein Skimmer
The Classic 150 SSS is a step up from the 100 series, covering larger tanks with more reaction chamber volume. At $384.99, it's a mid-tier Reef Octopus product that bridges the gap between the budget Classic line and the premium Regal series.
3 standout features: - Space-saving body design for sumps where larger footprints won't fit - Classic 150-series capacity for tanks in the 100-150 gallon range - Reef Octopus build quality and aftermarket support
With only 2 reviews at 5 stars, there's minimal direct Amazon feedback. The Classic line has been available through reef specialty retailers for years, and the brand's reputation translates regardless of the online review count.
If you're choosing between this and the Regal 150 series, the Regal's VarioS DC pump with controller gives it a meaningful advantage for long-term flexibility. The Classic uses an older pump design. For a 100-150 gallon mixed reef without demanding stocking, the Classic 150 SSS is adequate and saves money.
Pros: - More affordable than the Regal series - Space-saving design for common sump configurations - Reef Octopus brand reliability
Cons: - AC pump lacks the speed control of the Regal's VarioS DC - Limited Amazon reviews - The Regal series is a clear step up for the price difference
Reef Octopus Elite 200INT 9-inch Super Cone Protein Skimmer
The Elite 220INT is Reef Octopus's flagship internal skimmer, featuring a super cone body that reduces turbulence in the reaction chamber and maximizes contact time between bubbles and dissolved organics. At $1,108.79, this is professional-grade equipment.
3 standout features: - Super cone body design specifically reduces turbulence for maximum bubble-organics contact - Solid cast acrylic and PVC construction for long-term chemical resistance - Twist-and-lift collection cup for fast, mess-free skimmate emptying
The 9-inch diameter body and super cone geometry produce skimmate quality that's difficult to match with conventional cylindrical designs. For a heavily stocked 200+ gallon SPS reef where water quality is directly tied to coral survival, the engineering of the Elite series is justifiable.
At $1,108.79 with only 1 review, the purchase decision here relies on Reef Octopus's established reputation and the understanding that serious reefers don't typically document their equipment on Amazon. This is a specialty product evaluated through specialty channels.
Pros: - Super cone body maximizes skimming efficiency - Twist-and-lift collection cup simplifies maintenance - Top-tier Reef Octopus engineering for demanding systems
Cons: - Highest price point in this roundup - Essentially no Amazon review history - Appropriate only for large, seriously stocked systems
Reef Octopus Elite 200 Internal Protein Skimmer
The Elite 200INT is the 200-series internal skimmer, positioned for large reef systems needing serious organic removal. At $958.64, it's less expensive than the 220INT while still occupying the premium tier.
3 standout features: - Elite-series build quality with internal sump design - Reef Octopus DC pump technology for controllable output - Appropriate for 150-200 gallon systems with substantial stocking
With 2 reviews at 5 stars and the "See Description" product features, this is a product where Amazon's product page provides limited information. For this price tier, I'd recommend purchasing through a specialized reef retailer where you can get detailed specifications and customer service.
Pros: - Elite-series performance for large reef systems - Reef Octopus build quality and support - Internal sump design for stable operation
Cons: - Minimal product information on Amazon page - Requires specialized knowledge to set up and tune - Premium price tier
Regal 150SSS Protein Skimmer (B00SDQV9NA)
This is essentially the same product as the Regal 150 SSS reviewed above, listed under a different ASIN. The custom VarioS DC pump, space-saving design, and 150-series capacity are identical. At $716.09, the pricing matches the B00TJ2NM96 listing.
3 standout features: - Custom VarioS DC pumps engineered specifically for protein skimming applications - Premium solid cast acrylic body handcrafted construction - Adjustable speed with energy-efficient quiet operation
This appears to be a duplicate listing. If you're purchasing the Regal 150SSS, compare both ASINs for current pricing and availability before ordering.
Pros: - VarioS DC pump with adjustable speed - Premium handcrafted acrylic construction - Space-saving footprint
Cons: - Appears to duplicate another listing, verify before purchasing - Premium pricing - Only 1 review
IOAOI In-Sump DC Protein Skimmer for 60-90 Gallons
For reef keepers who want reliable DC skimmer performance without the Reef Octopus price, the IOAOI 60-90 gallon at $79.99 is the most practical alternative. The separately adjustable air and water controls, feed mode, and DC needle-wheel pump deliver a feature set that punches well above its price point.
3 standout features: - Independent air intake and water flow adjustment for precise foam column tuning - Feed mode pauses skimming for 10 minutes then auto-restarts, preventing overflow during feedings - DC needle-wheel pump provides quieter, more energy-efficient operation than AC alternatives
For a 60-90 gallon mixed reef with moderate stocking, this skimmer handles the organic load without the investment a Reef Octopus product requires. At 18 reviews and 4.9 stars, the early feedback is strong.
The honest comparison to Reef Octopus is this: IOAOI is a newer brand without the same engineering history, aftermarket parts availability, or community reputation. The Reef Octopus products cost more because you're paying for proven long-term reliability, not just initial specifications.
Pros: - Exceptional value for a DC pump skimmer - Dual-control adjustment for stable foam production - Feed mode is a practical daily convenience
Cons: - No track record compared to Reef Octopus - In-sump only - 90-gallon rating is optimistic for heavy stocking
IOAOI In-Sump DC Protein Skimmer for 110 Gallons
The IOAOI 110-gallon model adds an externally-mounted pump, patented cone chamber with deflector plate, and a 24V 700L/H needle-wheel system. At $159.99, it's the serious mid-range alternative to Reef Octopus Classic pricing.
3 standout features: - External pump mount allows maintenance without removing the skimmer body - Patented cone chamber and deflector plate reduce microbubble leakage into the sump - 700L/H DC pump at 11W for efficient high-throughput organic removal
The 43 reviews at 4.8 stars makes this the best-validated non-Reef Octopus option in this comparison. For someone running a 75-110 gallon reef who wants a step up from the 60-90 gallon model, this is the logical choice.
Pros: - External pump design simplifies long-term maintenance - Strong review count for a sub-$200 in-sump skimmer - Anti-microbubble technology protects display tank clarity
Cons: - External pump adds footprint in the sump - Less brand history than Reef Octopus - Air silencer requires monthly cleaning for consistent airflow
Buying Guide: Choosing a Reef Octopus Skimmer
Matching Skimmer to Tank Size and Bioload
Reef Octopus provides three tank size ratings for most models: light, medium, and heavy bioload. Be honest about your stocking level. A 150-gallon FOWLR with 15 fish is a very different system than a 150-gallon lightly stocked SPS reef. Use the heavy bioload rating as your planning number unless your system genuinely has minimal organic input.
Sump vs. No Sump
Every in-sump Reef Octopus model (INT, SSS designation) requires a sump. The Classic 100-HOB is the only hang-on-back option in this lineup. HOB designs are functional but less stable than in-sump models because sump water levels don't fluctuate with evaporation in the display tank. If you're planning a sumpless build long-term, the HOB is your only Reef Octopus choice.
AC vs. DC Pump
The Regal series uses VarioS DC pumps with 5 controllable speed settings. The Classic series uses older AC pump designs. DC is better for long-term flexibility and energy efficiency. If budget allows the Regal series, the DC pump advantage is real and worth paying for.
In-Sump Configuration
Reef Octopus skimmers work best in dedicated skimmer chambers with controlled water levels. The output height listed in each product's specs determines the ideal water level in the sump section. Position your sump baffle to maintain that level consistently, and the skimmer will produce stable, dark skimmate without constant adjustment.
Brand Reliability vs. Budget Alternatives
Reef Octopus products cost more because they have proven engineering, available replacement parts, and brand support through a network of reef retailers. IOAOI and similar brands offer impressive specs at lower prices, but without the same track record or parts ecosystem. For systems where consistency is critical (valuable SPS corals, large fish collections), paying for proven reliability is defensible.
FAQ
Are Reef Octopus skimmers worth the price?
For serious reef systems where water quality directly affects expensive coral and fish, yes. The engineering, build quality, and long-term reliability justify the premium compared to budget alternatives. For a fish-only tank or a casual reef, the price difference is harder to defend.
What does "SSS" stand for in Reef Octopus skimmer names?
SSS stands for Space Saver Skimmer. It designates skimmer models with reduced footprints designed specifically for sumps where standard-size skimmers won't fit.
How long does a Reef Octopus skimmer take to break in?
Typically 1-2 weeks of operation before producing consistent, dark skimmate. During break-in, the collection cup will fill with light, watery foam. Don't discard the skimmer if the first few days of skimmate look disappointing.
Can I use a Reef Octopus skimmer in a sumpless tank?
Only the Classic 100-HOB is designed for sumpless operation. All other Reef Octopus models reviewed here require a sump for proper installation and water level control.
What pump replacement options exist for Reef Octopus skimmers?
Reef Octopus sells replacement pumps through their dealer network. The Aquatrance 1000s (Classic series) and VarioS-2S (Regal series) are both available separately. This aftermarket support is a meaningful advantage over brands that don't stock replacement components.
How often should I clean a Reef Octopus skimmer?
Empty the collection cup every 1-2 weeks. Rinse the body and neck with RO water monthly. Clean the pump impeller every 2-3 months. The air silencer on HOB models needs monthly inspection since salt creep significantly reduces airflow through the silencer material over time.
Conclusion
For a sumpless reef up to 75 gallons, the Reef Octopus Classic 100-HOB bundle is the product to buy. For a sump-equipped reef in the 100-160 gallon range, the Regal 150-INT delivers the best combination of DC controllability and proven performance. If budget is the primary concern, the IOAOI 110-gallon DC in-sump skimmer offers strong performance at a fraction of the Reef Octopus price with genuine trade-offs in brand longevity and support. For large 200+ gallon SPS systems, the Elite series represents the top of what's available through Amazon. See also the broader Aquarium Equipment guide for context on how skimmer selection fits into a complete filtration strategy, and Equipment Aquarium for reef-specific equipment planning.