Petco carries a solid selection of fish tank supplies for beginners and casual hobbyists, covering the essentials you need to get a basic freshwater setup running. You'll find tanks, heaters, filters, water conditioners, food, basic medications, and common freshwater fish at most locations. For reef keeping or advanced freshwater setups, Petco's selection runs thin quickly, and you'll need either a dedicated local fish store or an online retailer for specialty equipment.
This guide cuts through Petco's full aquarium supplies lineup to tell you what's actually good, what's overpriced for what you get, and where the gaps are for more advanced setups. If you're setting up your first tank and Petco is your closest option, you can make it work. If you're past the beginner stage, knowing what Petco does and doesn't do well saves you wasted trips.
What Petco Stocks for Aquariums
Petco's aquarium section varies significantly by store size, but most locations carry:
- Tanks: Aqueon, Tetra, and Petco's own brand (Top Fin) in sizes from 1 gallon to 55 gallons
- Filters: Aqueon QuietFlow, Tetra EX, Top Fin, and Marineland Penguin hang-on-back filters
- Heaters: Aqueon and Tetra submersible heaters, Hydor Theo for larger tanks
- Lighting: Basic LED fixtures from Top Fin, Aqueon, and Fluval (smaller models)
- Substrate: Gravel and sand options, primarily from CaribSea and generic brands
- Decorations: Artificial plants, caves, and themed décor
- Water conditioners: Seachem Prime, API Stress Coat, Aqueon Water Conditioner
- Fish food: Tetra, Aqueon, New Life Spectrum, Hikari in various formulations
- Test kits: API freshwater and saltwater master test kits, test strips
- Medications: Ich-X, Melafix, Pimafix, Kanaplex (at some locations)
- Live fish: Common freshwater community fish, some goldfish, bettas, occasional saltwater fish at select locations
Best Petco Aquarium Supplies Worth Buying
Seachem Prime
Prime is legitimately one of the best water conditioners on the market, not just at Petco but anywhere. It dechlorinates, detoxifies ammonia and nitrite in a pinch, and works at a very small dose (1 capful per 50 gallons). Petco typically stocks Prime in multiple sizes and prices it competitively. This is always worth buying.
API Freshwater Master Test Kit
If Petco near you stocks this (most do), it's a reliable choice at a fair price. This kit tests for ammonia, nitrite, nitrate, and pH and provides significantly more accurate results than the test strips also on the shelf. Don't buy the strips. Buy this kit.
Hikari Fish Food
Hikari is one of the better fish food brands available at pet chains. Their sinking wafers for bottom feeders, cichlid pellets, and Hikari Micro Pellets for small fish are legitimately high-quality products. Better nutrition means better coloration, healthier fish, and less waste in the tank.
Aqueon QuietFlow Filters
The QuietFlow line from Aqueon is reliable entry-level filtration. Not the most customizable option, but quiet, available in multiple sizes, and backed by a long track record. They use replaceable cartridges, which is a running cost consideration, but replacement cartridges are widely available including at Petco itself.
Fluval Tanks (Spec and Flex Series)
At locations with a broader Fluval selection, the Fluval Spec III (2.6 gallons) and Fluval Flex (9 and 15 gallon) are genuinely well-designed tanks, not just generic beginner aquariums. They include competent filtration and lighting in a compact package. These are worth buying at Petco pricing.
What to Skip at Petco
Top Fin Brand Equipment
Top Fin is Petco's house brand. The quality is inconsistent. Some Top Fin products work fine; others fail prematurely or have design issues that aren't obvious until you've used them. Top Fin heaters in particular have a poorer reliability record than Aqueon or Eheim. At similar price points, name-brand equipment from Aqueon, Fluval, or Tetra is a better bet.
Test Strips
Petco shelves prominently feature test strips because they're convenient and have good margins. Skip them. The liquid test kits on the same shelf (API Master Test Kit) give you significantly more accurate results, especially for ammonia where strip accuracy matters most.
Decorations and Artificial Plants
Petco's decoration markup is steep. The same plastic caves and artificial plants are available on Amazon for significantly less. Unless you need a decoration today and can't wait, skip this category.
Generic Tank Starter Kits at the Entry Level
Very cheap all-in-one tank kits (under $30 for a complete kit) typically include low-quality filters and heaters that fail within a year. Spending a bit more on a better kit or buying components separately produces a more reliable setup that doesn't need to be replaced in 12-18 months.
Petco Saltwater Fish and Supplies
Petco carries saltwater fish at many locations, with quality that varies considerably by store and buyer. The selection is limited to common species: clownfish, damsels, chromis, small wrasses, and occasional larger fish. You won't find the diversity of species that a dedicated LFS carries.
The main concern with Petco saltwater fish is quarantine practices. Petco does not quarantine marine fish before sale, and marine fish are generally more disease-susceptible than freshwater species. Purchasing a clownfish from Petco and placing it directly into a display tank carries real risk of introducing velvet, ich, or bacterial infections. Running a 4-6 week quarantine tank for any marine fish from any retail source is standard practice in the reef hobby.
For saltwater equipment, Petco is genuinely limited. You won't find protein skimmers beyond basic entry-level models, two-part dosing systems, quality powerheads, or anything beyond the most basic test kits. For reef equipment, look at dedicated LFS options or online retailers.
For better selection on online options, our best online fish supply store guide covers where to find the equipment and livestock that Petco doesn't stock.
Petco's Aquatics Guarantee
Petco offers a 30-day live pet guarantee on freshwater fish and a 7-day guarantee on saltwater fish. This means if a fish dies within those periods, Petco will replace it or provide store credit. Keep your receipt and bring the dead fish back in a bag of tank water.
The guarantee is a reasonable consumer protection, but it doesn't tell you anything about why the fish died or whether the replacement will survive any better. Losses within the first few days typically point to shipping stress at the source or a tank that isn't properly cycled. A new fish of the same species in the same conditions often has the same outcome.
Petco's Vital Care Membership for Aquarium Supplies
Petco's Vital Care program offers discounts on repeat purchases of consumables like food, water conditioner, and filter media. If you're consistently buying these products at Petco, the program can produce meaningful savings over time, particularly on premium food brands.
For equipment and specialty supplies, prices on Amazon and dedicated aquarium retailers are often lower than Petco's Vital Care pricing, so the program is most valuable for the routine consumable category.
For a more complete picture of aquarium supply options across both local and online retailers, including specialty equipment and livestock, see our guide on oxygen machines for fish tanks and other essential equipment.
FAQ
Does Petco carry reef tank supplies?
Petco carries very basic saltwater supplies: instant ocean salt, a hydrometer or refractometer, and a limited selection of test kits. For dedicated reef keeping, they don't stock protein skimmers of any quality, two-part supplements, proper reef chemistry kits, or quality powerheads. You'll need a dedicated LFS or online retailer for reef-specific equipment.
Are Petco fish healthy?
Freshwater fish from Petco are generally reasonable quality, though it varies by store and the health of their supplier relationship. Petco freshwater fish typically aren't quarantined, so buying healthy-looking fish, adding them to a proper tank, and monitoring for the first two weeks is standard practice. Saltwater fish require more caution, as discussed above.
Is it cheaper to buy aquarium supplies online or at Petco?
For most equipment categories, online prices are lower. The advantage of Petco is immediacy: when a heater fails on a Sunday, Petco is often the only local option. Consumables like water conditioner and food are comparable in price to Amazon once you factor in shipping. For one-time equipment purchases like filters, heaters, and lights, online retailers typically beat Petco pricing by 10-25%.
What's the best filter you can buy at Petco?
The Aqueon QuietFlow series represents the best value among what's consistently stocked. The Fluval line, if available at your location, includes better options like the Fluval C Power Filter series. Avoid the most budget-end Top Fin filters for any serious setup.