hallo i have this problem and i dont know what to do every 15 days i take out the red thing but nothing hapent. PO4: 0 PH: night 7.90 day 8.30 CA:380-410mg/l Mg:980-1020mg/l Dh:6-7.the lights open from 15:00 to 21:00,
and they are new aqua medic T5 Reef Blue(open 1rst). T5 Reef White 10K(open 3rd) .T5 Reef White 15K(open 2ond).

and they are new aqua medic T5 Reef Blue(open 1rst). T5 Reef White 10K(open 3rd) .T5 Reef White 15K(open 2ond).
