Ulns lowering po4

[gqlmao]

A good skimmer will definitely help with your nutrient problem you should see improvements once it's broken in.

[Proteus]

I've been using prodibio for two years and find its a great way to lower nutrients. But you still need to practice good husbandry.
Is there a chance that you gf is over feeding?

Yes a skimmer is mandatory.
Also I tried Gfo with prodi. It doesn't work properly.
Do your wc keep up the podi and get that skimmer going