I just got 3 platys about a week ago. One passed yesterday (I think due to stress, and because it was a weak fish), but the other two look perfectly healthy and are eating great. The only problem is, they both sometimes have clear poop. I have seen them both with normal looking poop (and I see normal poop on the bottom of the tank), but I also sometimes see clear poop hanging off of them. I have read that this could be internal parasites, but I heard some people say that it just happens to their fish sometimes. I don't want to treat the tank without being sure, and other than the clear poop, my fish seem completely fine. Is this internal parasites, or is it just normal for platys?