Just lost my second fish in just a few days. Lost my 5" Bala Shark the other day and my 6 " White tip shark cat today. Only change to my system was a pleco I got from Wally worlsd. And bam a few days later everythng went to hell. Fish got white slime (fungus) and I did everything I could do, but still lost them. Watching the other fish, which look fine. Except my other cat's now appear to have Ich. What the hell.