how could the tank be to clean the temp is at 78 degrees and yes the yank is cycleing it has a whisper filter that filters 120gph so idk and idk what the ph lvl is and i just added salt to it yesterday after i got back from the lfs and i also baught some cycle its a thingy to make the fish live longer so idk what killed them over the past 4 weeks i have had 1 male die and 3 females 2 pregnant 1 not