No phosphate issues. No low flow issues. Nitrates at zero, but I keep getting this brown film with tiny bubbles on my sand. PWC
and suck out that very top layer in the bad spots and itsback within a week or two.
Can old lights do this too? I'm using the Coralife Pro, 3x150 HQ and 4x96 actinic03 bulbs.
I've replaced the HQ once already maybe a year or so ago. Keep thim on only 8-9 hrs daily. Never replaced the actinic.
How often should the HQs be replaced? Could the actinic be giving me problems also if not replaced?
What else should I be looking out for?