Watchman and a diamond

Are they compatible in a 75g long tank, my watchman doesnt do anythign but sit and wait till feeding time so my sand doesnt get clean. If there not compatible what should I get besides a star to create a sandstorm!

 

I have both. They have dens on opposite sides of the tank. They get along fine, usually, I have even seen them in the same den on occasion. That's rare though. Never had any ructions or scuffles in my tank.

 

awesome thats what I wanted to know, dang watchman. Hes a cool fish but is a lazy little bugger and only wants to eat, same with my cleaner all my fish do nothign except eat cept my sailfin which keeps the algae under control. Thank god for him!