Almost all my fish are hanging out at the top of the tank, mostly platys and molly's, it almost looks like there gasping for air.
Completed all water tests, and the results were good. Complete water changes every couple weeks, just did one about a week ago. Use carbon, ceramic cubes and filter pads in fluval 5xfilter. I have a 75 gallon tank with 30 fish, most small platys and a couple molly's, so i don't think its overstocked.
There are 3 fairly big plants in the tank, and part of the outtake of the filter breaks the surface of the water. I have never seen this behavior in the last 5 years this tank as been going, so im not sure if its a problem with oxygen. Only the platys and mollys are hanging out at the top, the angel, rainbow, cory and raphael cat fish seem to be just fine.
I have checked the water quality and temperature multiple times, and there all perfect. Any suggestions would be appreciated.
Fish hanging out at the top
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