Don't get me wrong I am not trying to sound harsh here, but the fact is that I think you might be moving a little faster than your research. Slow down a bit. Take some time find out what you are buying and how to keep it, and keep it happy. Buy all the proper equipment for you tank before adding fish and corals, this includes good lighting and RODI unit. Research what you want, and what you have to offer it.
The biggest problem in this hobby is that people move to fast. if you have lost 10 fish sense Dec. that means you are moving to fast. Did you have a proper cycle on your tank? If not that could be part of the problem.
I know people that don't add anything to their tanks for 3 months after they are first set up. Why because in this hobby to have success is to be patient.
If not you will throw a lot of money out the window, kill a lot of live stock, and end up tearing down the tank and getting out of the hobby.
Also it is this wasted killing of the fish that make this hobby more difficult for the rest of us, as demand rises, and so do the costs, while supply dwindles,,,