Yeah...there is definitely a learning curve to this hobby. What type of coral did you loose the most of. There is a lot of info out there, sometimes too much. If you are trying to keep sps, I find that they do better if they are totally isolated in a mixed reef tank with lots of flow in their direction, whereas if you have an sps dominated tank, you need lots of random flow throughout th entire tank. I also find that tank stability is also important. If I have to adjust anything in the tank I will wait until it's time for scheduled maintenance, and do everything that day so that the corals can settle down and no be disturbed until the next scheduled maintenance. Your tank is still looking great. Is that a yellow coris I see back there. I got one 3 weeks ago, still haven't seen him since I put him in the tank. Beautiful fish though.