Are you concerned about him? If so, what is your concern.
If it's about shrinking up, that very normal as a natural response to the environmental change (the water change) and will also do this when you feed and when he poops. He is still a bit young in the tank, as long as he does not stay skunk for more than 2-3 days at a time, I see no problem.
What about your lights. They love strong light availability and shade availability....can you describe the lighting your using?
Light provides 60-75% of the food for this animal....manual feedings are not required....but ok once a month....very small piece of shrimp.
So for parameters you have
Salinity 1.025 ish
Temp 78.5 ish
Nitrate less than 5ppm
Phosphate less than .005ppm
Ammonia 0
The above is correct (ish)