Do the fish cave. It sounds cool. I think you should have one small breeder tank dedicated to breeding platys and they could be feeders for the 600 gallon. I would do something with peacock bass, and a arowanas and have a schooling fish like a school of tin foil barbs are silver dollars. Dats would be pretty neat also with giant gouramis. A bio tope would be awesome. South east Asian biotope with datnoids, Asian arowana, giant gourami, and tin foil barbs. Or south american biotope. Silver arowana, shovelnose cat, silver dollars, peacock bass, maybe a Oscar or other large cichlid. A native tank would be cool largemouth bass, bluegill, channel catfish, some kind of gar or even a pickeral.
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