I too had Tin in my ICP a couple of months ago but the following month it was gone so not quite sure if was a valid reading. A lot of people were getting Tin in their ICP around that time for whatever reason. But anyhow, I also had issues with some of my SPS around that time which also corresponded with a fluconazole treatment. I didn't lose any but a couple of pieces lost coloration and polyp extension - even a few months post treatment the color and PE hasn't returned on those few

.
I'm in the same boat with Bryopsis come back so another treatment of fluconazole is immanent. I have to imagine it's just going to keep coming back so my new strategy is to get the rocks covered as much as possible with coral. My SPS has staked it's territory at this point so I'm going to let zoas fill in all the open rock space so no more bryopsis can grow (I hope).