Active Aqua Premium White Reservoir Cover

The Active Aqua Premium Reservoir Cover is designed to fit inside the top of matching Active Aqua reservoir sizes — the 20 gallon cover measures 31.50" × 24.50" and the 70 gallon measures 55.25" × 38.25". If you're unsure which size matches your reservoir, cross-reference your reservoir's internal opening dimensions against those measurements before ordering.

No — the porthole cover is sold separately. However, it is universally compatible with all Active Aqua premium reservoir covers, so the same porthole cover works whether you have the 20 or 70 gallon version. The built-in porthole opening is present on both sizes and ready to accept the cover when purchased.

The cover features multiple pre-marked drill access points that indicate safe locations for cutting cord and probe pass-throughs. Use a hole saw or step drill bit sized to your specific fitting or rubber grommet to create clean openings. Running cables and lines through dedicated drill points — rather than improvised cuts — keeps the cover structurally sound and maintains a tighter seal around each penetration.

The inside-fit design creates a more secure and stable connection than a lid that simply rests on the rim — it won't shift or lift from pump vibration or accidental contact. It also works in tandem with the convex profile: any condensation or water that forms on top of the cover flows toward the edges and back down into the reservoir, rather than draining off the outside of the tank.

Yes — light is the primary driver of algae growth in hydroponic reservoirs. Even brief or indirect light exposure on an open reservoir is enough to seed an algae bloom over time. A properly fitted opaque cover blocks light from reaching the nutrient solution entirely, eliminating the main condition algae needs to establish. Combined with regular reservoir changes, a cover is one of the most effective and low-cost algae prevention measures available.

The cover is sized for Active Aqua reservoirs and the inside-fit design relies on matching the internal opening dimensions precisely. It may physically fit third-party reservoirs with identical or very similar internal dimensions, but fit and function are only guaranteed for the corresponding Active Aqua reservoir sizes. Measure your reservoir's internal opening carefully and compare against the cover dimensions before attempting cross-brand use.