How do you airate your tank? Do you see your fish gasping a lot?
85 gallon and 140 gallon I have canisters and hang ons. Thats it. All fish are fine.
Smaller tanks, just hang on filters. All are fine.
As long as there is surface agitation, they arent needed in my opinion.
I have never used air pumps. OK, so maybe when I was a little kid for treasure chests and divers, etc.
