Thanks,everyone i know what you mean by keeping the tank immaculate, and whenever i say acceptable range i mean more like an exact range with very little to no variations(I did keep aros and kept them perfectly healthy). I am definately going to move my rays to a bigger tank after they reach about 7 or 8 inches. I'm also a very firm believer in overfiltration and underpopulation so it does make it easier to maintain my tank. For example my tank right now has 2 penguin 350's, an aqua clear 40, and a sponge filter attached to my powerhead, and i only have it stocked with 2 plecos a lima shovelnose, a bgkf, and 2 3" gouramis and i still monitor my tank very closely. I just figured i was ready for rays and didnt want to sink a lot of money in them. My local lfs just got in some "florida rays" but ive only every seen them once on forums and dont know much about them.