I bought this for a single dose of UGF in a 20 gallon hex reservoir. The inlet insert is very small and will not fit a standard tube. I personally don't think it's strong enough to work with UGF. The flow is moderate, which has its advantages on a tall and narrow tank, and yet it should be better than an Aeroston. Forget the air hose nozzle used to saturate the tank with oxygen. The edge where the air hose attaches is about an eighth of an inch high and the hose remains unattached. Hold the plug in the hole. I can get more. Haven't decided yet. If I use them on the UGF in my new ultra-tall 22 gallon and 18 gallon, I'll probably use two absorbers instead of one, which sucks (no pun intended) because it takes up more space and requires two more wires to connect.
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