I was not saying that if there is NTD, leave it alone. Of course, you have to remove the afflicted or suspected fish immediately. NTD rarely happens but if suspected, then isolation here it goes. NTD can happen but I wouldn't worry too much about it. Just get along with tank maintenance rather than trying to think about NTD which could destroy your pleasures of enjoying the hobby.tophat665 said:I lost 3 of my last 10 neons to NTD. They just have to be isloated IMMEDIATELY when you suspect they have it, and it won't spread. Not a big deal in a 99 cent schooling fish (sucks to be the fish, mind you).