Tired of banging my head, help pick a fish

[ron101]

I'm in the same boat as Mark except in this case my tang is a sailfin. The only other fish in my 90 gal is a maroon clown. Im planning to isolate these two and redo the rock work (the clown seems ok with other fish but he doesnt like me playing with the rock) before adding any fish again. Just wondering what sort of success people have had doing this and if its possible ot overdo it (ie if the new fish get too much time alone and then the isolated tang now gets picked on).