I have a 20G aquarium. It's good! The best part is that you don't have to use bubbles and/or lights. Separated from the wall you have a bubble wall. Unplug the pump, you've got the light! He is great! The only complaint. I wish the cables were a bit longer so I have room to wiggle. It fits but is quite tight. It also comes with an air hose which I wasn't aware of. NOTE: I have a 20G aquarium with a 30G pump (I think) and it works fine. It's not a strong bubble wall, but it still works great!
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