The mushroom makes itself into a ball the size of a volleyball, the tang must have swam into the ball for some reason before the top of it fully closed. My tank is a 55, but there is plenty of swimming room because I didn't load it up with as much LR
as usual. My yellow tang had plenty of room and seemed to like it, I think a white cheek would be alright, I was wondering if they were hardier than powder blues. I figured they would be hardier because they are from Hawaii. My buddy told me fish from the Maldives are usually caught with cyanide, which is harmful and stressful to the fish. Thanks for your opinions, I hope I'll have pics someday!!