Hair algae

[Malenurse]

I keep getting thick hair algae growth in my 24 gallon despite having 0 phosphates and 0 nitrates (new Salifert kits). All other parameters are perfect. I run GFO and carbon all the time and have a Tunze skimmer. My lighting is a 150 watt Phoenix 14K, 10 hour photoperiod. I change 5 gallons/week.
Any suggestions?

 

[luther1200]

How many fish do you have? How often do you feed them?

 

[SeanT]

Dollars to donuts you have phosphates in your rock that is being leeched up by the HA which is why your test kits have a reading of 0.

 

[Malenurse]

I have 3 fish (averaging about 1" each) and feed them a little mysis and Cyclopeze every day. What's the trick for getting the phosphate out of the rock?

 

[SeanT]

There is no trick.
You can "cook" it.
Or continue to manually remove it.

 

[crvz]

Agreed with SeanT. In my experience, purging or "cooking" the live rock is the most sure-fire way, but continued improvement on nutrient import/export can accomplish the same end result (though likely to take a lot longer). Increase skimming, water changes, and manual removal of the hair algae combined with less feeding and you'll likely to see some improvement after a few months.