So i am not new to the reefing game but new to any forums. My SPS started dying off 3 months after I upgraded my tank. All my parameters are stable using salifert and Hanna meter so I know its not that. It started when the temps here in the east started dropping and the boiler was coming on more often. My tank is upstairs but my sump is in the basement close to the oil boiler. My initial thought was the teflon paste I was using on my pump but I since changed that yet corals are still dying. I also thought maybe my alkalinity was swinging or my temps but Ive been testing alk everyday over the past month and it is stable as a rock using my salifert test kit and my temps have no major swings using my controller and looking at my thermometer every few hours. I am now thinking my oil burner could be letting out a little soot that im not seeing from the dampner and getting into the sump which is about 5 ft away from the boiler. Right now I am so stumped I am just about to go fowlr. Is there a chance the boiler could be poisoning the tank? Its not a pest i have checked that also and I am losing montipora as well not just acropora and I lost a large soft coral and a LPS coral and I dont think there is a pest that eats all 3. Any suggestions would be welcome. I also have used polypads 4 times and nothing comes up with that.



