Although I am not on ZEOvit my system has low nutrients (NO3 < 0,5mg/L and PO4 < 0,03 but far from undetectable). I have strong skimming, strong lighting, and perform weekly 5% water changes. I've always added trace elements, amino acids and feed my corals on a daily basis. I've tried a number of different products from different manufacturers (ie. Seachem's ReefPlus, Amino Stabil, etc.).
Two or three months ago I started dosing CV and AAHC (ZEO's concentrated amino acids). I just happened to get one of the first batches of Pohl's CV to arrive in my country.
I did notice some changes immediately that I really couldnt tie to anything but the CV. Just after starting CV everyone noticed that the tank looked amazing.
After about three or four weeks I started to notice new axial coralites. First on one or two corals and now on just about everything.
There are really too many things going on in my tank to say this is because of this or that. Its not trouble free either. I've got my share of headaches. But overall I'm happy and I'm going to stick with my dosing. Two friends who visit me regularly are also convinced (at least enought to give it a shot). They bought their CV and started dosing it last week.