I can’t get rid of gha!

[jmoney7]

I have had gha since starting my 13.5 gallon evo in august. I scrubbed the rock before now adding it to my reefer 170. It’s all back now I scrub it weekly with a toothbrush to get off as much as possible. And I’ve been running phosguard in the sump.

My parameters
Ammonia:0
Nitrate:0 I think my Api kit sucks especially with nitrate because I have never gotten a reading higher than 0
Ph:7.9
Salinity:1.023
Phosphate:0
Calcium:440
Alk: 10dkh

All this was tested 02/27/24
I also turned my lights from 11 hours to 8 and reduced the whites

 

[RedReefer]

Was it originally live rock from the ocean? Or dry rock?

 

[jmoney7]

Dry rock.

 

[RedReefer]

I hate to say this. I had green hair algae in every tank that I used dry rock. I now have all ocean live rock with no GHA.

 

[jmoney7]

Yeah that’s what I figured it’s just so expensive but maybe I should just save up and replace all my dry rock with live

 

[Pistondog]

If there is nothing elseon the rock, like coralline algae, then another algae like gha is likely to take over.
Get some urchins or turbo snails, and continue the manual control.

 

[RabidDragon]

as your tank matures this will resolve, your in the "ugly stage"

 

[jmoney7]

Ok thank you for the advice I have an urchin currently it’s just too long