| Walt,
I've never heard of Chemi-clean (or similar products) being effective on hair algae.
These are antibiotics, which are usually used for Cyano, which is a quasi bacteria-algae.
The advice they gave you is good if you are to use this (we actually put Venturi tubes onto our PH's - more effective than an airstone) ... but again, I don't believe an antibiotic will have any effect on hair algae.
Hair algae is a pain - my best recommendation is several small successive water changes, and maintaining good & stable ca/alk/pH levels.
Manually remove as much as you can.
P04 can actually be pretty difficult to test for - and may be there, but not apparent. What kind of foods are you feeding - additives, etc.?
TDS reading on the output water?
Lights not old, right?
Bioload?
I think you've more than likely covered all this, but just double-checking.
__________________
~ Teri
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"You do not need a parachute to skydive. You only need a parachute to skydive twice."
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