One of the nicest benefits to a FOWLR tank is you can kill the lights for a few days to knock off any algae growing in the tank.
You can always lower the intensity of the lighting, or the photo period.
Are you growing macro in your sump? Get an aggressively growing macro algae and run the lights in the sump for a longer photo period than the main tank.
As far as the clean up crew, it'd be a toss up by any means. You MIGHT find some success with larger hermits and snails, but there is no guarantee with your motley crew. ( nice fish selection btw )
One last option is to be on the lookout for a tang that really does it's job cleaning up the reef. I've seen yellow eyes go to town on almost every kind of algae.
If only there were extra large blennies haha! I have a bicolor that is worth it's weight in gold.
Edited by Pete Moss - January 31 2013 at 12:25pm