You can get away with a smaller tank now but if your planning on keeping him his whole life I wouldn't keep him in anything smaller then 180 gallons blacks usually max out at around 18 to 21 inches in home aquarium and a 180 is 2 feet wide so he will be okay in that and just keep good filtration and you should be fine but bigger tank is always better but a 180 should be okay for him his full life
Well I unfortionately need to put him in my 40breeder for now it has a monster eheim canister on it but how long can he stay in there I kno they grow super slow but he don't even got red eyes yet and still has spots any ideas? Thanks for all the feed back!