big enough to hanldle a coral cat and a gray bamboo but i don't want to go with anything larger like a banded bamboo. if already looked into that about getting into a tank close to 1k gallons and wide enough to give ample swimming room with a decent footpring and what not. this is more just based on curiosity as to see what they can and cant live with.
My Nurse ate Niger Trigger, Damsel 3 clowns, Goby, star fish, and a few other nice fish but that was when I really wasn't sure and the person who i bought it from said most of my reef fish would be fine. Which honestly now that all I have are sharks. I can't say all the time but most sharks around the same size don't eat each other.
because im not about to venture into a shark that is that large. i am really thinking 30" or under. so coral cat or marbled cat shark. id be iffy going any bigger