Well this ecosystem miracle mud is not a new concept but a very interesting filtering system. I have not used it but I am not going to knock it but people have good results with it.
But let me warn you by saying that it is a denitrification filter which has mud, warms, and caulerpa (plants) to take out the nitrate and at the same time can be found in most current setup which consists of a deep layer of sand bed (6"

. Many people have stated that the company is in fact selling mud from somewhere which is rich in nutrients, worms etc. There is no miracle to it.
Do realize the contents of miracle mud. It contains a lot of iron and aluminum which supercharges macroalgae growth and plant growth. This mud works but are you willing to spend and arm and a leg.
http://www.lars-sebralla.de/ma_miracle.html
You can try the system and get back to us but most people use this current setup:
1. 4-6 inches of deep sand bed (aragonite)
2. 1lb/gallon of live rock
3. good skimmer
The hardiest fishes have to damsels, clowns, triggers.