a 150, fluval FX5 plus whatever fluvals i have laying around, 6' double bright lighting, some sand in bottom (so far planning estes' plain white marine sand), a pair of reticulatus, a pair of albino Polypterus senegalus, a pile of driftwood at one end for the bichirs, weekly 50% water changes (my water comes in at 6.6 or so and soft), frozen foods and maybe hikari sinking carnivore pellets and new life spectrum. fishless cycling, then the bichirs first since i already have them (they are both about 6-7"). then the biggest retics i can find (probably just 4" or so) that i know are eating frozen already. will it be an issue if i get one ray and then wait (hopefully not too long) before getting the second?