Why am I growing GHA?

[Zeal]

Title.
Phosphate 0.089
Nitrate 0-1
Alk 10
Calc 460ish

been dosing NoPox (5ML) daily for 2 months in order to finally drop it to acceptable numbers (Was around 25++) now I’m fighting to even see nitrate so I dose 1.5ML of ME Nitrate to bring it up every other day. My corals are growing, I have polyP extension

I notice I have GHA on my frag rack in certain spots.

I also have lettuce algae that grows on random frag plugs which is extremely annoying. I have to remove it manually

 

[Chrille26]

I believe algae that is already estabished in the tank is really hard to get rid of by lowering nutrients. Algae is very effective at taking what it needs to stay alive.
If you have some good grazers in your cuc then having low nutrients and constantly removing what is there will in time make it dissapear.
Im still learning myself though so I might be wrong and you will get better advice from some more experienced.

 

[Zeal]

It’s just weird the spots in grows in, and it’s not like it’s a dead zone there my tank has lots of flow.

ive removed It with my fingers but it just ends up growing bacK. Oh and my CUC avoids it like the plague