Green Hair Algae

[Ytsejam02]

Hi all,

I'm getting green hair algae on specific rocks. The other rocks look great. It's very strange to me when I look at my parameters:

Ammonia = 0
Nitrites = 0
Nitrates ~ 0. If it's above 0 I can barely tell.
Phosphates ~ 0. I don't believe it's 0. It's very low though. my tests just aren't good enough :-/
Calcium = 420
dKH ~ 10
pH = 8.0-8.1
Salinity = 1.026

So, is it possible that there's something up with the these specific pieces of rock?

I have 15 pieces of rock, and 4 very specific rocks are growing it.

Additionally, these rocks also seem to be attracting the most coralline algae. That algae is growing quite well on these rocks.

At the moment, I periodically take them out and scrub off the algae.

Does any of this make sense to anyone? I'm trying to figure out if there's something else I need to do to get control of the issue, but not sure what to do at this point.

Thoughts?
Thx!

 

[Nick92515]

What's your filtration like. When it comes to dry rocks some rocks just leach phosphates more than others. How old is your tank

 

[Ytsejam02]

It's only 4 months old. I did use several pieces of dry rock. Fwiw those aren't the rocks that have the greed hair algae, tho I'm guessing that doesn't mean anything.

My phosphates don't register high enough to get a decent reading.

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[pyithar]

i'd move those rocks around and see what happens. maybe they're in places where algae like to grow.

 

[JammyBirch]

i had the exact same issue, my tank is all dry rock but the pieces of live rock i put in there to seed the dry rock grew algae, GHA and coralline, like a champ.

My reasoning was that the GHA and Coralline were on the live rock when i put it in there and it grew there. It didn't really move to the dry rock for some time. I eventually removed the seed rock with the GHA scrubbed it and dried it out, it's in my fuge now. I think the dry rock leached the phos and it grew on the seed rock it came in on.

Now all of the dry rock is live rock with coralline and no GHA, thanks to the ATS.

 

[Ytsejam02]

I've been taking it out and scrubbing it but haven't dried it out. One has a small coral fresh mounted to it. :-(

I'll keep up with the scrubbing and see what happens. Just seemed so odd that it was these surviving pieces. The other live rock is fine.

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[wildman926]

Launch an algae turf scrubber. Grow the hair algae where you want to, and remove the excess nutrients in your rocks.

 

[Martini5788]

Mine does the same thing. Drives me crazy. Let me know if you find a solution, I would love to know!


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[mabu03]

make sure you have enough water flow

 

[boxfishpooalot]

Same happened to me, then i built an ats.

 

[FlyingFishSKYw]

I battled green hair algae for about a year. I tried everything: 3-days of darkness, dosing Tech-M, several sea hares, carbon dosing, peroxide scrubbing, etc... what eventually got it was cycling the bad rocks through my sump. Took months, but I finally got rid of it all.