Cheato question

[rainbowfish]

I have a CPR refugium fixture, and I used to can grow lot of Cheato, and I have remove them every other week. But lately, I can't grow any for some reasons and the cheato turned yellow. The light bulb is 2 months old. thanks

[smallreef]

what has changed in your water chemistry or you fish population? either it isnt getting enough nutrients or light.... if the bulbs is the same spectrum as you have always had and its newer then that would lead me to what you are feeding or dosing in the tank?

[rainbowfish]

I do notice that the PO4 level goes up to .02 and Nitrate is up to 20. Other than that, everything else is very much the same.