Naso tang, rabbitfish or sea hare?

[michika]

I highly doubt that the bioload is contributing. I think the algae has just established itself due to overfeeding like Doug mentioned. Since he's got everything else under control now, its just a matter of cleaning up the left over algae. You have a couple of options, 1) manual removal - PITA, 2) letting it dissapate naturally - bad idea in the making 3) biological removal - sorta of simple.

I'd avoid the hare, they seem to be quite picky on what they want to eat, frequently eating some algae and leaving others. Same goes for rabbitfish.