*** WARNING *** Don't you kids try this at home! Before After I was going to thin out the algae bed. It was so thick it just came out in one piece and threw it in the trash. The result was an NO3 spike. The corals turned brown and started tissue recession. One coral bleached out. Waiting for the Triton test to come back. before After Before After Before After Before After Before After Before After I now realize just how important the algae bed in the refugium is. The lights are turned down to a minimum. No3 is 1 ppm. A 30 gallon water change from the 145 gallon system. Temperature is 75º. Salinity 35. Stopped dosing everything and will start dosing elementz only at the entry level to maintain 7 DKH. Monthly Triton water testing. I'm open to suggestions to get the tank back on track? I'm not sure if I should cut away the dead coral yet (coral with no tissue left)? I notice tinny bugs at some of the tissue recession and bought a six line wrasse? Not all corals show damage? The fish are fine? On a positive note reef keeping is all about learning, right?