Great Choice of fish Ryan. I Love these fish
But, anyway
Definately either a 55 or something like
a........30 ;D But, remeber that would be almost the only thing in there, because the severum is a semiaggressive fish with the body being large as the male can get up too a foot and the fem up to 9 inches. So you are going to want a large tank for the pair as they mature.But, a little about the tankmates they should be little at any.The best fish would be a Festivium or 2. As i mentiopned above that they are semiaggressive fish leaning to agressive fish. But, a little about on how the envoirment. THe tank should be actually heavily Planted with just a few rocks and hopefully the fish do not dig up.Well, on breeding this fish the male is very aggressive at spawning time so you would want to take out any other tankmates for that. THe femle can lay up to 1000 egg soo don't be surprised if alot die or else you are not going to like on how you are gonna get rid of these fish. Well, did i cover everything if i didn't just tell me and i will give you the info on the Severum fish.Hope the Best ;D