Cool. A Lucas thread! I love this formula. I have read every thread by Lucas I could find, twice. Couple of notes: Lucas only recommends using the 0/5/10 ratios if vegging under fluro. If vegging under HID it is 0/8/16 all the way. The updated preference is GH FloraNovaGrow. Same nutrient mix as the 0/8/16 in 1 bottle. Mix well. Use it at 8ml/gal of tap water (under .5 EC or RO) comes out to 2.0EC and 5.8PH. Perfection. The addback works great. No buildup for the whole cycle. The only other thing I add is H2O2. Here is the link for the nutrient calculator if you wanna run your current nutes through it to see what your really feeding: http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm If you cant figure it out just post the chem breakdown from the backs of your nute bottles and I will run it for you. AN 3part would work fine and in theory you could do the addbacks with any nute combo as long as what you are feeding is all in the right concentration to not build up as it is taken by the plants. FNG is 2% Mg so MG def is rare. A very slight N def can occur during the stretch but it clears on its own.