have you considered a bleeny? In my case mine has been the hardiest of all my fish with the most personality and of course he helps clean!

Be careful with clowns...in my experience they are pretty, but they are like a chihuahua...let someone else have them...every clown I have had has bit me...they run from the other fish, you think they're cute and docile...but the minute my hand goes in the tank to clean, they attack...just remember to keep bandaids handy