I have two condys. They were fine out in the open until I upgraded my lights...now they have sought shadier spots. I threw one away that I thought was dead, he shrunk up to the size of a 25 cent gumball with tentacles all limp, I was afraid he would poison my tank so I flushed him. Well he indeed was not dead, and yes I feel bad. That has been my only stupid mistake so far. Mine ate a few damsels before I started feeding them cocktail shrimp. I feed two small pieces of cocktail shrimp every other day and they leave my fish alone. They are interesting inhabitants of my tank, fun to watch, not real hard to keep happy. HTH