Sick YellowTail Wrasse help

[warriorcookie]

Ca 380ppm
Alk 6dkh
Mg 1450ppm
Nitrate 0ppm
Ph 8.05
80.7 F


Alk and Ca are low, It's water change day yesterday, but was out of town. I'll be doing my usual 10% today. I have a doser coming to help keep it up and stable, I know it's a problem but doubt it's related to this.

He has never eaten the mysis or cyclop-eeze that I feed. I always add garlic to the food, but how much do I put in the water as a dose? It seems he only wants to eat the copepods...