Green Hair Algae Breakout?

[METZCOOL]

Ok, New tank setup with ro/di 0 TDS water and dry Marco rock and dry tropic eden sand and sand rinsed and rock pressure washed. After 1 month into this I started to have the worst hair algae outbreak growing out of this rock that I have ever seen?
Skimming wet and plenty of flow 25% weekly water changes and a sea hare working his tail off is not even putting a dent in it.
Anybody experience this with marco rocks and if so how long did it take for your hair algae to go away?
Looking at Lantham Chloride dosing since only 1 fish in 250 gallons of water, and rocks are put together with rods and epoxy so no pulling out to cook.
GFO would not dent it if phosphates are leaking from rock from what I heard?
No phosphate meter at this time as I never had the need for one.
Any Ideas ?

 

[Dr. Reef]

hair algae is common in all new tanks. turn the lights off for a week, rung gfo and carbon. do water changes and try to bring the nitrates and phos to 0.
true dry rock can leak phos for a while but if u control it with gfo and chaeto in fuge u will be able to bring it down enough where algae will not be a big deal. a good clean up crew can keep the rest at bay.

 

[zeebies]

I also have Marco dry rock and use Tropic Eden sand. The rock is very clean but there are still detectable phosphates that must be dealt with. After an initial scrubbing and rinsing, I've had my rock sitting in heated, circulating saltwater for months. I change the water every 2 weeks.

I did not want algae problems.

I set up a small test tank after a few months and put the "seasoned" MarcoRock in. Not one spot of hair algae and it's been a while now. I'm in the middle of a tank build so I know that the rock is good to go when I'm ready.

This takes time but it works - at least for me.