From what I have read from other peoples experiences, six-line wrasses work fairly well if you do your part to remove as many of the red flat worms as you can so the wrasse has a chance to keep up with them multiplying. You can try to siphon them up or I just take a algae cleaning pad and wipe them off the glass. I'm also going to try to get some quinulex and try that as they have taken over some of my rockwork.

P.S. - My blue tang in named Papa Smurf!