speak of the devil, on my trip to one of the local fish shops to buy some filter cartridges tonight, guess what i saw. lol. a freshwater lion fish. $59.99. it was about 6 inches long. didn't move the whole time i was there. a bad-@$$ looking fish tho. looks just like the pictures in that link i gave ya. they said they have it in a brackish tank, and just keep small feeder goldfish and big feeder guppies and thats what it eats. with the size of the fish there, i'd say you would at least need 29 gallons, and that is probably not enough for it. i bet a 46 bowfront would be the best minimum size tank for it.