When you say die, can you be more specific? Stn, rtn, bite marks, overnight death, ect. Any polyp extension and how's the colors?
It's super slow STN (1 month to kill an sps). It starts as a white rim around the base and gradual whitening at the very tips. There are no bite marks.
I dipped a few of them in Revive and no pests were noted.
The STN seems to improve with 5-10% water changes. For awhile I tried doing these every other day and it seems to help, but as soon as i stop the STN advances again. I thought it might be a missing trace element so I changed salt to B-ionic (from Red Sea Coral Pro), no difference.
Parameters:
kH 8.18 (Hannah meter and double checked with Salifert)
Mg 1430 (salifert)
Ca 410 (salifert)
NO3 0... undetectable (salifert)
PhO4 0 (Hannah Meter and Salifert)
Lighting:
4 t-5's now about 9 months old (but STN occured ever since I set up tank)
2 Reefbrite LED supplements (each puts out the about the same par as a T5 bullb).
Bulb combination and tank depth in my signature.
GFO and Carbon (about 1/4-1/2 the recommended amount) in BRS dual reactor.
ATO with Kalk disolved in freshwater ---changed all the DI/RO filters a couple months ago thinking that could be the problem (I think I filled the tank with filters that were about a year old when I set it up).
Tossed a Poly Filter in a few months ago to see if that was the issue, but no color change was noted. (I was worried about copper or something).
I have never added supplements or any special additives.
Tank was started with clean MacroRocks and the tank was cycled using Ammonia from Macrorocks.com. Seeded tank with a piece of my old rock form last tank.
Clam is thriving and LPS are fine too. Inverts are all doing well. Coraline growth seems a little slow compared to my last tank (it too seems to speed up after water changes).
There is one Sunset Monti that seems to be defying the sps curse that has afflicted every other sps (about 3 rounds of 5 corals placed a month apart). The sunset monti is growing rapidly and looks great.
Coral sources have varied LA DD aquacultured, maricultured, and wild.
I even left tank fallow of SPS for a month (though, there was likely pieces of dead coral stuck in the rock).
pH 8.4-8.27 over the course of a day.
Temp 79-80 (double checked with second digital thermometer)
SG 1.025
Colors are basically fine. A little dull, but they are not browned out.
ARGGGGGGG! :headwally: