Making pale acros darker

[Proteus]

I've noticed lately my acros have become quite pale. I do understand this happens in a zeo tank but would like my darker colors back.

Zeo tank
Po4 undetected
No3 undetected
Cal 450
Alk 7.5
Mg 1420
Temp 80
Lights 250w halide 20k 8hrs

I dose amino acid, coral vitalize, coral booster... I use to dose flatworm stop which makes colors darker but it's 90$ a bottle

Any suggestions