Ok so let me get this all straight since you left out a TON of information.
You don't do water changes, you don't test for anything outside of Calc and Alk with an API kit.
The first picture in that thread, where the Nem is sitting on the right side of the tank from 5/8 when you got it, shaded from the light by the softy above it, it doesn't look healthy.
There are so many variables here, that unless you are willing to meet us half way, ie give us a full set of actual parameters you go take today:
Temp
Salinity
pH
Alk
Calc
Mag
Nitrates
Phosphates
What light do you actually have so we can help with tank positioning
Without the above info I don't think there is much more myself or anybody else is going to be able to help you with. That Nem hasn't looked healthy for 1 month at least and it looks to me like it's slowly declining.