Its run on FM zeo as I was asked to use it by Uk importer. It allows me to run tank at low nurients with very little hassle and they keep giving it to me free. Biggest factor for successfull Sps I think is oversized skimmers, circulation, lighting and a stable system. When I say stable i mean keeping nitrate & phos low and maintaining a good level of alk, cal and Mag. I don't worry about temp swings my tank is know to rise and fall 2.5degs a day. I don't let it go over 28deg and I run it at 25.2.
The tank has been running nearly 4 years and time is biggest factor to a good looking tank IMO