What water are you using? RO/DI or RO or tap, etc?
Okay, not sure I have this correct, but you said you were adding the AB+ on schedule? Is that a trace element replacement dosing method? If so, you should not be doing that yet. Without corals to absorb them, you do not need to replace them and could be throwing values off. I never dose anything without actually measuring its usage (if it is new to me).
Get the salinity up to the target of 35ppt or 1.026 specific gravity. This will help keep the inverts happier. What snails are you buying? Some just do not handle change well and some do dormant during travel and some just do not work well in new systems.
Zoas can be touchy. A good starter test is gsp or palys. These can give you some help stabalizing and you can always remove them when you decide on the type of system you want. Just keep them confined to a rock away from other rocks (a bit more difficult in a 10g).
If I misunderstood what you were saying, please let me know. I want to give you accurate information.