Hey fellows it's been a week now since I took out my sandbed and everything looks stable again. I Haven't had any losses since then or tissue loss and the corals are opening up nicely again and coraline algae has been growing quite a bit. Some of my corals which I thought were dead are actually showing little bits of colour on some branches as well so I might be able to save them.
I can't really pin point the loss on anything other than my sandbed. The water was quite dirty in the bin that I siphoned all the sand and detritus into but I dont think it could have been the detritus traped in the sandbed that caused this because my ammonia nitrites nitrates phosphates alays came up as 0.
All i can think of is if the power heads were blowing the sand around which caused hydrogen sulfide to slowly release into the water? I think carbon neutralizes the hydrogen sulfide but maybe it was a steady slow release? I'm stumped...
This barebottom thing takes some getting used to but I think it's growing on me
Thank you everyone for your help!