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hello, i have a 55 gallon (long) tank. its about to complete its "new tank" cycle, and will soon be ready for my 2 3-4" tiger oscars. I also have a 6-7" pleco. what other, if any, fish can i add? assuming i'll get another, much larger, tank in the future, can i get a Pacu (same size as oscars), and keep him happily in a 55 gallon for a while?