a couple of questions:
what are tank inhabitants, fish, inverts?What is your clean up crew ?
how many lbs LR
how old are your lights?
how long has your tank been up?
silicates (don't know if you can test for that)
coule of suggestions:
continue with 20%/30% H2O changes weekly.
manual scrubbing and siphon.
run tank dark for about 3 days, then limit your lighting until it goes away.
hair algae is difficult to get rid of as it is however with limmiting your source of Phosphates and DOC
it will go away . You may also consider a phosphate sponge to help as a bridge while you get rid of the HA ... It is a real pain but sometimes taking out all the LR
and scrubbing it down , rinsing in fresh Salt H20 and placing in a bin of fresh salt H20 in a dark room will help kill it off (it is also known as cooking your LR
) ... Just remember that you will need to keep that water pristine and the temp and water moving so that it doesnt kill off your bacteria ...