Possum wrasse is docile so calm/non-agressive tank mates otherwise he'll hide all the time. They'll eat just about anything you put in the tank, mysis, cyclops, brine, pellet, flake but it needs to be on the smaller side, they have tiny little mouths. Minimum of a 20 gallon tank and some rock work to take shelter in if it gets spooked. Nothing outrageous or special really.
So far this one prefers to swim out in the open in the upper half of the tank away from the LR.
I need to get a pic of him/her from the front because this fish has little pink puckered up lips.