Doubtful it was a parasite..maybe the acans themselves died and wiped out the tank. I almost had a small colony of acans wipe my tank out last week. I was doing water changes the last few days I think I'm going to do another one just to be on the safe side. Don't get discouraged man $#!T happens. It happens to us all just get back up on that horse. I have some leathers and stuff I could hook you up with.
Thanks!