Well lately I've been having problems with the water being cloudy, but that is just going to take time to fix. Also for a while I've been noticing the the fish crap in the tank is very long. Origingally I thought that maybe the fish had eaten a hair that got in the tank, buy upon further investegation it kept happening. I've mainly noticed it on the bottom feeders, given they don't move about as much. But the other day an iridescent shark died, and I found that his stomach was very large, and that his arse was swollen red. As sad as that is I still haven't figured out what could be causing this, I have looked and it isn't hair getting into the tank. I feed the fish of course flake food, tubifex worms a few times a week and peas occasionaly. Anyone have any idea what could be causing this? Should I stop feeding them tubifex worms? Thanks.