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? What would you guys recommend for this tank? Also bear in mind that I don't really want to have to do live food all the time (can sharks eat frozen?) Thanks in advance!