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One is powerhead driven, one is San air powered sponge filter. Most gas exchange occurs at the surface, which area is increased with agitation. I was worried I was going to start losing fish, so slowly ran 10 gallons of 72f water into the tank. All of the fish congregated on the bottom for the...

I run an fx6 with lots of surface disturbance as well as an internal filter at the other end. I did raise the temp to 81f when I saw what I thought was a spot of ich on a tetra. I'll lower to 79 and see if that improves their rapid breathing. Thanks for the response!

Hello all. I put my fish (18 tetras, lemon and red phantoms. 1 dwarf puffer, 2 yoyos, 2 platties and a guppy) into a 10 gallon (with display tank water) overnight so I could empty and put flourite sand in the 120 display tank. Tank has completed cycle over 2 weeks ago. Fish seemed happy in the...