the tank is 72''x24''x24'' . cycled . 200lbs of pea gravel, 3 large peices of driftwood. as far as the filtration i have 1 wet/dry filter that is curently doing 900ghp after head loss. i have 2 visi stealth heaters. one 18 watt uv sterilizer. and 1 aqua clear 500. i love arowanas so i would like 1 of them. i also like catfish and any type of bottom dewelling fish. sorry but i dont really like stingrays that much, dont know much about them. hope this info helps determin a stocking list.