po4 and zeo

[Proteus]

I've been on the zeo train for about 6/8 weeks. I've been all over the zeo forum for advise but am still fighting po4.
I've tested ro water and nsw. I dont overfeeding and skim wet. Also change filter sock everyt wo days

Along with po4 I'm also loosing to stn

Any advise is appreciated

Alk 7.8
Cal 410
Mg 1460

Po4 0.36