With out a doubt I bet ich has something to do with it as well. I just had a breeding 10g tank of rossies and tried to cure the ich that they always usually have had them for the full nine weeks and noticed the new borns had ich immediatly. I tried using ich guard and lost all 50 and I started off with twenty five. So I would say ich is the culprit. It's almost with rossies once they have it the have it and it's only a matter of time. Oh well I am going to have to start over from scratch. But the temprature advice might help you as well the do not like deg. over 80 unless you gradually work it up to that deg. I know that Petsmart keeps the feeder tank at 65-70 deg. Sorry so long.