So I have a 240gall tank that will be going into my appartment in the fall. It is 8x2x2. I would really like to put a cat shark in there, but what type of maintenance do they require? What type of food? Also what kind of fish will they play nice with? Can I put an eal in there? So far I was thinking of putting a black volitan or two and a spotted grouper in there as tank mates, as they are both fairly stout fish. What should I do in the way of filtration? And what about substrate? I've had a 55gallon tank for about 9 years and have had all kinds of smaller fish in there, minatus groupers, volitans, damsels, clows, tangs, wrasses, some angels, even a butterfly. I really like angels butterflys and tangs, but I don't think (esp the angel and butterflys) that they will go well with the other fish (shark) what do you guys think? Will larger tangs and triggers do ok in there?