07-16-2008, 01:01 PM
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You're probably in for quite a war zone there. I wish you luck. At least one of those guys will probably get killed before they are full grown. Probably more. And as they grow it will quickly become obvious that a 75 isn't big enough for those 4, even if they do get along. My brother has two Oscars, a tiger and an albino, each in its own 30 gal, and both of them are too big for their homes. In a 75 gal, split 4 ways, they essentially will each have about 20 gal worth of territory apiece which is far too little for a large cichlid.
Maybe you should think about narrowing down to one species, getting 2 females and a male, hoping that the male pairs up with someone, then removing the extra female. There are other fish which are compatible with big cichlids, so the tank doesn't need to look empty. Synodontis catfish or Plecos come to mind. They should be able to coexist with a large mated pair of cichlids, and will occupy different areas of the tank.