AtlFish, lions are great fish to own. Like it's been said, they are very placid. I had 2 in my 180G(sadly one just died recently
) with an untold amount of LR. I rearranged it all 1 day and my biggest concern was not getting stung, but accidently smashing one. Now you wanna talk about an aggressive fish, my Sailfin tries to bite me every time I go into the tank lol. Actually it only does it till it realizes it's a hand and not food. It did bite me once and hurt like the dickens!