Just added my second Neptune DOS. I'm now maxed out on my modules on my Apex Jr.
1. FMM (for ATK)
2. FMM (for topping off my topoff reservoir from RO/DI)
3. VDM (controlling my return pump speed)
4. DOS (for dosing Alk and Ca)
5. DOS (for dosing NoPox and maybe acropower)
6. Auto feeder
7. Extra EB4
Since my tank only has a tiny piece of a montipora, the Alk dosing is really low, I can maintain 8.2 dKH with only 3.5ml of the Aquaforest 2+ a day. Ca is undetectably used, so I'm not even dosing that anymore. Once I get the new SPS pieces in, I anticipate my Alk/Ca to start being consumed again. My Mg is so high because of my Aquaforest salt, so I don't think I'll ever need to dose that.
The Nopox is keeping dinoflagellates at bay, and unfortunately I'll have to do this forever. I stopped dosing for a week and I started seeing dinos come back. I started dosing again and within two days they were all gone again. I've found the sweet spot of 2.5ml a day that keeps the dinos out.
Since things are running low in nutrients, I'm thinking of dosing a bit of acropower once the SPS have established themselves. I may have to increase my NoPox, but at least there will be more food for the corals. I will, however, introduce a bunch of chromis (6) into the tank after I finish their QT. Hopefully the poop will help and acropower not be needed. If I do dose acropower, I'm planning on dosing throughout the lights off period, with the outlet tube going right into my return chamber.