I still stand by Red Slime Control. I have chalices, SPS and LPS. I have never seen any bad things occur from the use of it. I also don't water change after I use it. I do turn off my skimmer and only use the product for 24 hours. Then I drop the water level in my sump and let my skimmer wet skim it out. This method has never failed me. I think the key is to not leave it in your system for 3 days like it says to. Then I raise my water level back up with the same water I removed. Sorry for your losses, I hate losing anything!