venom550pm
Member
Really sorry to hear about your losses. It is devastating to lose a colony you have grown out from a frag. Keep your head up.
I have been wracking my brain for the last ten minutes on what could be causing the problems. I keep coming back to flow for some reason. With the tank becoming packed and traveling leading to less maintenance, I wonder if the vortech starting getting dirty (they drop flow rapidly as algae and bacteria growth develops on the impeller) and the loss in flow was just too much for the corals. That would also help explain the cyano. It could also be a phosphate issue, or even more likely, the combination of the two. I would expect your phosphate tests to read zero because most of the phosphate is being used up by the algae outbreak.
How do the other parameters check out?
I agree with Jason. I have noticed too that the Vortech's drop flor rate when they get dirty, then this cycle can start.