Who Gives A Fish Forums

Thanks for the tips, all. Mag's at 1300, so I'll bump that. Bulbs are 10 months old… might be time. Running a MP40 on reef crest mode, but I'll tweak the flow. Dosing Two-Part daily, alk's pretty steady. Gonna test mag more often.

My SPS corals aren't thriving like they used to. I've been keeping alk stable at 8.5 dKH, but growth is slow. Anyone else run into this? Tank's a 75g with Radion lights, running a Reef Octopus skimmer. Parameters are 0 ammonia, 0 nitrite, 5 nitrate, 420 calcium. Weekly 10% water changes with Red Sea ...