Acros's Bleaching

[Airborne]

I had to move my tank to my LFS until I relocate. The move was quick and smooth. They moved it for me. The tank has been at their shop since May9. Since then, the Acro's have started to bleach and lose color. 3 out of 11. Anyway, the tank developed a brown stringy type of algae. The LFS syphoned out water and added new salt water. The same water that I have been using since day one. Anyway, 5 gals one day and 3 another. So I was told. But they did not dose. I use Tropic Marin Bio-Cal and Bio- Mag. Along with Kent Super DKH buffer. Anyway, I tested the water and the levels are normally Mag-1395, Cal- 385-400, DKH 9.5-9.9, PH 8.1. The levels dropped as follows Mag-1250, Cal-355, DKH 6.5, PH 8.1. I dosed yesterday and retested today: Mag-dropped again to 1150, Cal-increased to 385 and DKH- increased to 9.9, PH 8.1.

Could this swing be what is causing and or caused my Acro's to bleach? If so, will they continue to bleach until they die? can they come back? What can I do at this point to save the rest from sliding? I also have LPS Acans and Zoo's that are not to happy either.

What to do?

Thx

 

[revaltion131]

It sounds like an alk and possibly a nitrate issue. The swing from 8.1 to 9.9 was definitly damaging, speaking from personal experience, anyway. The climb down to 6.5 probably wasn't good either. If your corals are just bleached and are not visibly experiencing tissue necrosis, I'd say you have a chance at revival. IME, you can frag all you want, if a coral starts to RTN, it will all go. Some people have had luck, I haven't, so take that for what it's worth in your experience. The zoos should be fine. You will probably lose some polyps, but not the whole colony. When I had some nasty alk swings, my zoas looked PO'd. That was over a month ago and they still haven't reopened, but they are not going away.

Your best course of action is to keep your water quality as stable and pristine as you can, and everything should come back with T.L.C. I hope that helps.

 

[Airborne]

Chemistry

Thanks for the help and input.