The fact that the tank is brand new makes sense for everything IMO
. I agree that the LFS
was correct to be patient, but I don't think that you have to add a fish right away since you have an abundance of liverock in there. You have established marine life on the rock (whether you can see it or not) that will be going through it's life cycle and continuing the nitrogen cycle. If you feel it necessary, add a bit of fish food to the tank every few days.
I would still recommend allowing the tank to mature for a few months before you start trying to manipulate the conditions with buffers and additions. The initial cycle is a fairly brutal process, and with the fluctuations in PH
and everything else it is no wonder that test results may not be perfect.
, unless you are planning a stony tank, I also feel that the calcium being at 350ppm is perfectly acceptable.