I have a friend who's father decided to invest in a marine aquarium. They wanted to buy 'Nemos', the oscelated clownfish, for the tank and they've gone through three of them already. The father did water tests and lots of research and he's baffled. They have anemones in the tank and a few other fish (I don't know what species) and live rock. Could it be a parasite or clown-specific disease? I'm more of a Freshwater owner, so I wasn't sure what to make of it when she asked me for help.