I added a purple goniopora 3 or 4 weeks ago to my tank. I have several ORA gonioporas for years without any problems. Two days after I added the purple one I lost a fairly large healthy birdsnest. It took about 3 or four days to go - it was very fast. A couple of days ago I lost a stylo that was right above it and it went really fast. The owner of the LFS (whom I trust a lot) thought it might be a chemical reaction. All my other corals are looking good and all the tank parameters have been good for years. Does the chemical reaction sound reasonable to you guys? Thanks Paul Just an after thought. I fragged my red goni and when I put the new frags back in the tank I had a really bad reaction. A lot of my corals got really stressed and several changed colors. I assume that was chemical reaction.