Are you testing the PO4
on the tank water or the RO
water? I would test the RO
water and also get a TDS
reading of the RO
water. Are your bulbs new? I know you said the tank has been up a few months but was this a new setup or a used one. I would probably change the bulbs regardless.
Cut back on feeding as well. I don't think phytoplex is all that good really. Some of these additives can fuel algae.
can't be that high either. With a reading of 920 you would see Ca
flake in the water. Would like like snow. IO won't read that high anyway. Buy a salifert Ca
test kit. These don't cost much more and are more accurate.
Struggles in the hobby can be very frustrating. We have all been there to some degree. Keep plugging away!
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,