The Aquatic Life 115 Protein Skimmer is a hang-on-back skimmer rated for tanks up to 115 gallons that uses a recirculating skimmer design with a modified needle wheel pump. It's a solid mid-range option in the HOB category that works without a sump, making it accessible for beginners and intermediate reef keepers who don't want to run a full sump system. At around $120 to $150, it sits between budget skimmers and premium options from brands like Reef Octopus.
This guide covers how the Aquatic Life 115 actually performs, how to set it up correctly, how to dial it in for your tank's specific bioload, and how it compares to alternative options in the same price range. Whether you're buying one or already own one and need to troubleshoot, you'll have the information you need.
What Makes the Aquatic Life 115 Different
Most HOB protein skimmers use a simple venturi design where a pump draws water up and simultaneously pulls air through an intake tube, mixing the two in a reaction chamber. The Aquatic Life 115 uses a recirculating pump design, meaning the same water passes through the pump and reaction chamber multiple times before exiting. This gives the bubbles more contact time with the dissolved organics, which theoretically increases efficiency.
The needle wheel impeller on the pump breaks the air/water mixture into smaller bubbles than a standard venturi design. Smaller bubbles equal more total surface area, and more surface area means more organic material can attach to bubble surfaces before they rise to the collection cup.
In practice, this design produces good skimmate consistency once the skimmer is properly dialed in. Users report that setup takes longer than simpler designs because there are more variables to adjust, but the resulting performance is more stable once the skimmer finds its operating point.
Tank Compatibility and Sizing
The 115-gallon rating is, as with most skimmer ratings, optimistic. It assumes a lightly stocked tank with minimal feeding. For real-world use:
- Lightly stocked 115-gallon FOWLR (fish-only with live rock): Adequate
- Moderately stocked 75 to 100-gallon reef: Works well
- Heavily stocked 50 to 75-gallon reef with large fish and heavy feeding: Borderline, may struggle to keep up
The hang-on-back design hangs over the tank rim and requires clearance behind the tank for the skimmer body. The unit is approximately 7 inches wide and 15 inches tall, including the collection cup. Make sure your tank stand and wall clearance accommodates this.
Tank glass or acrylic thickness: the mounting bracket fits tanks up to 5/8 inch thick. Thicker glass (found on some larger rimless tanks) may require the optional thick-glass adapter.
The Aquatic Life 115 operates in tank water between 5.5 and 8.5 inches from the intake to the water surface. This makes it suitable for standard aquarium water levels but can be tricky if your tank water level fluctuates from evaporation. Pairing it with an auto top-off system stabilizes performance significantly.
Setup Instructions
Installation
- Attach the mounting bracket to the inside of the tank rim. The bracket has a foam pad to protect the glass from scratching.
- Hang the skimmer body on the outside of the tank so the pump and intake tube hang into the water.
- Adjust the intake tube depth so the pump impeller is fully submerged.
- Connect the air intake tube to the pump fitting (it's a push-fit connection, no tools needed).
- Position the collection cup on top of the skimmer body.
Initial Startup
Fill the tank water to its normal level before starting the skimmer. Turn on the pump and let the skimmer run without adjusting anything for the first 24 hours. During this time, the pump and collection cup surfaces are breaking in, and the skimmer will likely produce wet foam or overflow. This is normal.
After 24 to 48 hours, start dialing in the skimmer by adjusting the collection cup height. The Aquatic Life 115 has a twist-adjust mechanism on the collection cup that raises or lowers the foam rise height. Twisting it to allow higher water level inside the skimmer reduces foam rise. Twisting to lower the water level increases foam rise.
Target position: foam that rises slowly and steadily into the collection cup, producing dark skimmate that's about the consistency of tea. Not watery, not syrup-thick.
Break-In Period
Most users report 5 to 10 days before the skimmer consistently produces quality skimmate. Patience here pays off. Don't make multiple adjustments per day during break-in. Make one small adjustment and observe for 12 to 24 hours before adjusting again.
Dialing In the Skimmer for Your Bioload
After break-in, the skimmer needs periodic re-tuning as your tank's bioload changes. A 50-gallon reef that was lightly stocked when you bought the skimmer may be heavily stocked 6 months later, and the skimmer setting that worked then may produce either too little skimmate or overflow the cup constantly.
If the collection cup fills with watery liquid in less than a day: Twist the cup adjustment to raise the internal water level (reduces foam rise). The skimmer is running too aggressively for current organic levels.
If the collection cup fills slowly with very thick, dark skimmate: This is usually fine, meaning the skimmer is processing organics efficiently. If it barely produces anything, check that the intake isn't partially blocked and the pump is running at full flow.
If foam production stops entirely: Check the pump impeller for debris. Hair, plant matter, and fine sand can wrap around the impeller and stop it. The impeller is accessible by removing the pump from the skimmer body.
After water changes, adding new fish, or adding new live rock: The skimmer may go through an adjustment period of 24 to 48 hours where production is erratic. This is normal.
For comparison with other skimmer options across different tank sizes and sump vs. HOB designs, our guide to the best protein skimmers provides side-by-side performance comparisons. If you're considering moving to an in-sump setup as your tank grows, the best in-tank protein skimmer resource covers models designed for different sump configurations.
Maintenance Schedule
Every 2 to 3 days: Empty and rinse the collection cup. This is the most important maintenance task. Skimmate left sitting in the cup deposits a film that reduces cup performance and can cause the cup to overflow at random.
Weekly: Wipe the inside of the skimmer neck (the tube between the reaction chamber and cup) with a paper towel or cloth. Organic film on the neck reduces foam rise and is one of the most common causes of a skimmer that "stopped working" after previously running well.
Monthly: Remove the pump and rinse the impeller housing. Pull the impeller out and check for wrapped hair, plant material, or debris. Rinse under tap water and reinstall.
Every 3 to 6 months: Deep clean the entire skimmer body by soaking in dilute white vinegar (1 cup per gallon of water) for 2 to 4 hours. This removes mineral deposits (calcium carbonate buildup) from the interior surfaces that can restrict bubble flow. Rinse thoroughly before reinstalling.
How the Aquatic Life 115 Compares to Alternatives
At the $120 to $150 price point, a few other HOB skimmers compete directly:
Reef Octopus BH-100: Uses a Sicce pump and produces very consistent skimmate. Most experienced reefers consider it a step above the Aquatic Life for reliability and ease of tuning. About the same price.
Coralife Super Skimmer 125: Similar HOB design with a collection cup that slides rather than twists. Less consistent skimmate production than the Aquatic Life 115 in direct comparisons, but slightly easier to mount on tanks with unusual rim profiles.
Aqua C Remora Pro: A long-standing reliability benchmark at around $200. The Remora Pro doesn't need as much tuning, rarely malfunctions, and has excellent customer support from Aqua C. If your budget stretches, the Remora Pro is the HOB skimmer most experienced reefers would choose.
The Aquatic Life 115 occupies solid middle ground. It performs better than budget options and costs less than premium skimmers. For a moderately stocked reef in the 50 to 100 gallon range, it's a reasonable choice.
FAQ
Can the Aquatic Life 115 be used in a sump? The Aquatic Life 115 is designed as a hang-on-back skimmer and isn't optimized for sump use. There is no leg or adjustable base for sitting in a sump's water chamber. Some users have reported modifying it to sit in a sump, but this isn't the intended application and can affect performance. If you want to use a skimmer in your sump, Aquatic Life makes sump-rated models in their Reef Series (Aquatic Life Reef Series 115 In-Sump Skimmer) that are purpose-built for that application.
How long does the pump typically last? The recirculating pump on the Aquatic Life 115 typically lasts 2 to 4 years with regular cleaning. Replacement pumps are available from Aquatic Life directly and through their distributors. When the pump starts running loudly, loses suction, or shows irregular foam production despite a clean impeller, it's usually time for a pump replacement rather than a new skimmer.
The skimmer keeps overflowing immediately after I plug it in. What's wrong? This is almost always the break-in phenomenon described above. New skimmers produce wet foam for up to 10 days. Let it run and empty the cup frequently. If it continues overflowing past 10 days, check for soap or lotion contamination (never handle skimmer equipment with product on your hands), and verify that no tank additives (medications, additives, new filter media) were introduced that could disrupt skimmate production.
What's the correct water level for the Aquatic Life 115? The pump should be fully submerged with the intake approximately 6 to 7 inches below the water surface. Running the skimmer at a lower water level reduces skimming effectiveness. Running it at a higher water level (if your tank is overfilled) causes the water level inside the skimmer body to rise, flooding the collection cup. Maintain a consistent tank water level, ideally with an auto top-off system, for best results.