why are you asking then? even though you dont care what anyone haves to say? just because the armatus will live longer dosent mean hill live for that long in your tank. smaller tanks will shorten its life anyways. the armatus wont be able to swim and will beat the sh*t out of its self trying to move wich will shorten the life aswell. for that size tank your better off getting a smaller type of payara like tats. but I dont see why Im waisting my time when you dont care. Ask the seller to ship some kleenex tissues along with the fish so you can blow your nose the day he gose belly up and youll know why he did.
geez dude no need to get pissy at this. Just asking if you don't like my question don't answer it! just wanted to double check!