I don;t know if anyone remembers, but last December, I had a strange event happening in my 60G cube (water turned pink, corals unhappy, then seemingly things recovered after massive water changes, carbon etc.).
Ever since, I can't keep sps corals alive in that tank.
They start out doing great and even grow a little, but then slowly start dieing from the tips down.
If I take the coral out when there is still sufficient tissue alive and put the in my 120G, they recover and do well again.
All softies and LPS, fish, snails, crabs are doing fine in the tank, and parameters check out fine, but it's a death trap for sps.
Does anyone have any ideas what the cause could be, and what I could test for that's beyond the usual tests (ammonia, nitrite/trate, calcium, alk, magnesium, phosphates, temp, pH)?
The only other thing I have changed since is the MH bulb, but the issue was happening before then.