I test my Alk every two days. For the last month it’s been 9-9.5. Thinking the combo of high light (2x250 watt radiums plus 4x54watt t5’s) plus higher alk plus low nutrients has just made the corals weak. So any small change, they react? Just my theory
What do you consider low nutrients? At phos 0.02 and nitrate at 1, cabin running 25/7 and a uv sterilizer my water is pretty clear. If I have alk above 8.3 things start to go bad.
