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I've had no GHA on mine, I do have a nasty slime issue though. I sometimes add GFO to a little carbon bag I place in the chamber after the skimmer. I check phosphate with the Hanna checker and it always reads at or close to zero.
Are you using RODI water? In a previous tank I used to have alge issues all the time until I started using RODI water.
I also have a macro algae in the display that I like to out compete the ugly algae.
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