Tipping point

[Gizmo]

Oi! I'm at the end of my rope on this one. I've got more Hair Algae than I know what do to with. I've manually pruned the whole tank, added a crew of snails and crabs, an urchin, an algae blenny and I've tried a scopus tang, who i might add didn't even have the slightest interest in the stuff. PO4 is 0 obviously because the HA is at it, and the nitrates are below 2. I've done 100g+ water changes in the last week, and the crap keeps growing. running a phosban reactor for months, changed the media too... not sure where this leaves me. Ideas? maybe go FOWLER and get some butterfly fish? dunno.