Brine shrimp. Bloodworms. Spectrum pelletsWhat where you feeding them?
I guarantee I have TONS of oxygen and I use prime every week. I do 25%This is possibly the case but make sure there is no chlorine. And declorinator your water with every water change. There may also be other aspects that are depriving your fish of oxygen
I dont need to do gravel cleaning as everything sits on top of sand and I get that stuff every week when I do water change (20-25%)How often do you do water changes? Whens the last time you cleaned it?
I have a new hang on the back filter it is the top fin 40What kind of filters are you running?