My Dovii will be going into his permanent home here in a couple weeks. 60"x36"x30" =280gal, that is plenty for them. Where as the Umbee is more of an open water predator so I would say a 6' 135 gal would work fine for a while, but eventually a longer tank around 8'. I say a 240 gal @ 8'x24"x24" would be perfect.