I'm feeling majorly freaked out right now. Between breakfast and now, all but one of my harlequins dropped dead(they were perfectly fine before), and Tux has developed some serious SBD. I don't have epsom salt, but I do have aq salt, which I'm currently using with him. He was in 1 tsp per gallon for a few days to help his fins grow back after he ate them, so I'll just keep him in the salty water.
Tux was floating in the harlequins' tank which was heated to 80*F . He was in a 1/2 gallon tubberware (100% w/cs daily) to try and help him relax and regrow his tail. I'm worried that whatever killed my harlequins might be in his water because of possible cross contamination >.< Either that, or my new aqueon heater killed them somehow.
I'm considering doing a massive water change on the harlequin's tank, and continuing to float Tux there, as well as floating my surviving harlequin who is rather sick. Do you have any other tips, suggestions, anything?