Lee's makes a line of protein skimmers primarily aimed at budget-conscious aquarists running small to medium saltwater tanks. If you've seen the Lee's Counter Current Protein Skimmer or the Lee's Tri-Corner Protein Skimmer on the shelf at a fish store or listed online, you're looking at a category of equipment that gets a lot of mixed reviews. Here's the honest breakdown of how these skimmers work, who they're appropriate for, and where they fall short compared to modern designs.
Lee's protein skimmers use an airstone-based counter-current design that was standard technology for aquarium skimmers through the 1980s and 1990s. Water enters the reaction chamber and air bubbles from a wooden or ceramic airstone rise through it, removing dissolved organic compounds as foam that collects in a cup. This design still functions, but it has been largely replaced by needle-wheel and venturi skimmers in most performance comparisons.
How Lee's Protein Skimmers Work
The Lee's skimmer design is a counter-current air-driven unit. "Counter-current" means the water flows one direction through the reaction chamber while air bubbles flow the opposite direction. Water enters from the top or side of the reaction tube and exits at the bottom, while air enters at the bottom and bubbles rise upward. This creates a longer contact path between bubbles and water than a co-current design, which improves organic removal rate.
The air injection comes from an airstone connected to an external air pump (not included with most Lee's models). Wooden airstones produce very fine bubbles, which provide more surface area per unit of air than coarser ceramic airstones. Finer bubbles equal more efficient foam fractionation.
The foam produced rises up through the reaction chamber neck and collects in a removable cup. When the cup fills, you remove it and dispose of the skimmate.
How It Compares to Needle-Wheel Designs
Modern needle-wheel and venturi skimmers use a modified pump impeller to shred air into microbubbles, bypassing the need for an airstone entirely. Microbubbles are significantly smaller than what a wooden airstone produces, providing greater surface area and more efficient organic removal.
Lee's counter-current design is not as efficient per unit of cost as mid-range needle-wheel skimmers like the Bubble Magus Curve 5, Reef Octopus Classic 150, or similar units in the $80-150 range. A Bubble Magus Curve 5 running on a 65-gallon tank will produce more skimmate and remove more organics than any Lee's counter-current skimmer on the same system.
This doesn't mean Lee's skimmers have no place. For very tight budgets on small tanks, or for supplemental skimming in a sump where a second unit is needed without spending much, the Lee's counter-current skimmers can contribute to water quality. The key is setting realistic expectations.
Available Lee's Skimmer Models
Lee's produces several skimmer configurations:
Lee's Counter Current Protein Skimmer (Small): Designed for tanks up to about 30 gallons. Uses a single airstone and a basic reaction tube design. Mounts inside the sump or can hang on the back of smaller tanks.
Lee's Tri-Corner Protein Skimmer: A corner-mount design that sits in the back corner of the aquarium. The triangular footprint takes up minimal space in the tank. Rated for tanks up to approximately 40 gallons. This model includes a small chamber that filters return water before it enters the main aquarium.
Lee's Internal Protein Skimmer: A submersible version that sits fully inside the aquarium or sump without external hang-on connections.
All Lee's models require a separate air pump to operate. The air pump size affects bubble production and skimmer performance. A quality air pump with low noise and stable output (like the Tetra Whisper AP 150 or Aqua Culture 2-outlet) makes a noticeable difference in Lee's skimmer consistency.
Airstone Selection and Air Pump Requirements
The airstone in a Lee's counter-current skimmer is consumable. Wooden airstones (limewood or beechwood) produce the finest bubbles but degrade relatively quickly, typically needing replacement every 2-4 weeks. They also clog with mineral deposits and salt creep.
Ceramic airstones last longer but produce larger bubbles. For a Lee's skimmer, wooden airstones are the better choice for performance, but you'll go through several per year.
Air pump sizing matters. The pump needs to supply consistent, adequate airflow to the airstone. For the small counter-current model, a pump providing 100-200 cc/min is sufficient. For larger Lee's models or if you're running two airstones, go up to 300-400 cc/min.
Tetra Whisper air pumps are quiet and reliable for this application. Rena pumps are also commonly used and produce stable output without the noise some budget pumps generate.
Installation and Placement
Lee's counter-current skimmers can be installed inside the tank as an internal unit, or hung on the back or side of a sump.
Internal placement puts the skimmer body directly in the display tank or sump, with the collection cup accessible above the waterline. This is simple and doesn't require any plumbing connections. The drawback is that internal skimmers take up tank or sump space.
For tanks without a sump, the Lee's Tri-Corner model is designed to sit in the back corner of the main tank. This keeps the skimmer body mostly hidden and uses dead corner space.
Fill the reaction chamber to the correct water level as specified in the instructions. Too low and foam production drops; too high and skimmate becomes very dilute and watery.
For a comparison of skimmer options at various budget and performance levels, our guides on best aquarium equipment and top aquarium equipment cover needle-wheel and venturi skimmers alongside budget counter-current options.
Tuning a Lee's Counter-Current Skimmer
Getting consistent skimmate from a Lee's skimmer requires patience during the initial tuning period.
After installation, run the skimmer for 24-48 hours before making adjustments. The water level inside the skimmer and the airflow rate are the two variables you can control.
Adjust the water level by changing where the inlet or outlet sits in the water column. If skimmate is too thin and watery (tan or light colored), lower the water level inside the skimmer slightly. If the cup collects almost nothing after several days, raise the water level.
Adjust airflow by changing the air pump output or restricting the airline tubing with a valve. More air generally produces more foam, but excessive air produces large inefficient bubbles that pop before reaching the cup.
Good skimmate from a Lee's skimmer looks medium brown and has a somewhat thick, foamy consistency. Don't expect the near-black, viscous skimmate you'd get from a well-tuned needle-wheel skimmer on the same system.
When a Lee's Skimmer Is (and Isn't) the Right Choice
Lee's protein skimmers are reasonable for:
- Very small starter saltwater tanks (under 30 gallons) on a tight budget
- Supplemental skimming in a sump where a second, inexpensive unit is useful
- Fish-only saltwater tanks with light to moderate stocking where chemistry stability isn't as demanding as a reef tank
Lee's protein skimmers are not ideal for:
- Reef tanks with corals, particularly SPS corals requiring pristine water quality
- Tanks with heavy fish bioloads requiring aggressive organic removal
- Aquarists who want consistent, low-maintenance performance
If your budget allows, a used or refurbished needle-wheel skimmer in the $50-80 range, such as a used Reef Octopus or SCA-301, will outperform any Lee's counter-current skimmer on a comparable tank.
FAQ
Does the Lee's protein skimmer come with an air pump? Most Lee's protein skimmer models do not include an air pump. You need to purchase a separate aquarium air pump to operate the skimmer. Check the packaging or product listing for the specific model you're considering, as bundle options occasionally exist.
How often do I need to replace the airstone in a Lee's skimmer? Wooden airstones typically last 2-4 weeks before performance degrades noticeably. Keep a supply of spare wooden airstones on hand so you can replace them as soon as bubble size increases or foam production drops. Ceramic airstones last longer but produce larger, less efficient bubbles.
Why is my Lee's skimmer not producing any foam? The most common causes are: the airstone needs replacement (blocked pores, producing large bubbles rather than fine ones), the water level inside the chamber is incorrect, the air pump isn't providing adequate flow, or the tank hasn't fully established a bioload yet. New tanks often take a week or two to develop enough dissolved organics for consistent skimmate production.
Can I run a Lee's protein skimmer in a freshwater tank? Protein skimming is far less effective in freshwater than saltwater, and Lee's skimmers are designed for saltwater use. Freshwater doesn't support stable foam fractionation nearly as well as saltwater. For freshwater tanks, the functional equivalent for water quality management is frequent water changes and mechanical filtration rather than skimming.
Key Takeaways
Lee's protein skimmers use an airstone-based counter-current design that works but is outperformed by modern needle-wheel skimmers at comparable price points. They're most appropriate for small, lightly stocked saltwater fish tanks on tight budgets. Key maintenance points are replacing wooden airstones every 2-4 weeks and tuning the water level inside the chamber for medium-brown, moderately concentrated skimmate. If your tank requires consistent, aggressive organic removal, such as for reef keeping or a heavily stocked system, upgrading to a needle-wheel skimmer is a meaningful improvement.