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Tropical Fish Tank Setup Questions? - tropical fish setup

First Probally I would not create a community tank that I have Probally the creation of a single species, preferably a dwarf cichlid tank reservoir or pump or reservoir and Goram angelfish say = /, that the reverse osmosis for my tropical aquarium when you Speed to wait until you have had, before they could put in any fish?
And thank you some tips on how to keep membranes would be great, thanks!