Ok I'm fairly new to this. I started with a 56g tank and added a few corals and fish corals being a few hammers a dunkin, Montipora. The fish being a few tangs and clown fish. Well long story short the fish out grew that tank so my great girlfriend surprised me with a new 210g tank. I built it from the bottom up. I have a 55g sump with fudge. It's been up and running for about a year and I can't seem to keep most of the corals alive. The hammers seem to be fine but the dunkin closed up and I lost a few others. Now I have been to a couple of lfs and have been working with a few guys there. I don't have exact numbers but the test my water weekly and it always checks perfect. Iv been battling this for months now. The water parameters never seem to change. Always on point. I do weekly water changes and use the Red Sea coral salt. I dose with the Red Sea reef foundation abc+ and use fuel. I spot feed them often. I don't know what to do. I can't keep loosing everything. The lighting I'm using is the Ajm reef LEDs. The same light I had great luck with on my 56g tank. Any help would be great. Thank you