I have some cichlids that i have been raising for a month and out of no where they look to be sick. They are pooing normal, i have been doing 50% water changes every other day since they were born and have been feeding them the same high quality baby food. The only thing that changed was that my sponge filter didnt seem to be getting enough oxygen in the tank for the 60 fish(in a 20 gallon) so i put another aerator in there. The fish were all fine and about 3 days later i see them swimming all weird and jetting around the tank. They jet around the tank and then stop and kinda float head first towards the top. It looks like a pre-spiral of death. Is there anything i should treat the tank with or anything i can do??? The only thing i could possibly think could have caused this was something on the airstone?? I did a 50% water change today and yesterday so I dont think it would be in the water anymore. Anything i should treat the tank with just in case? Add salt or raise the temp or anything like that?