new fish for clown & dotty

[Mranderson]

looking for ideas on any fish i could possibly keep with a slightly aggressive saddleback clown. he likes to chase. chased an azure he was with since the startup (year and 7 months ago) but moved him due to continually nipped fins. also have a strawberry dottyback in there. hes mostly around the bottom and in caves. didn't give the azure much trouble but chased him out of caves. 30 gal tank. i know it can be hard to add to established fish. just feeling for suggestions.

I would also be interested in hearing what could be paired with my azure damsel in the 20 he now has all to himself. thanks all.