Zoa melting after purchase

[saltwatertabk]

Went digging in my camera roll and found a pic of my first ever zoas, you can see where circled one half completely died over the course of the first month and that second half with just a little green visible didn’t open up for two whole months, I came to the conclusion that it was my parameters were whack, phosphates were at .30-.50 and nitrates were almost 0 - phosphates now range from .07-1.2 and nitrates 20. half made it through till I got everything right and stable and half didn’t

That’s interesting my nitrates seem very low off of the master api test kit I do need to raise them up possibly. hoping to get a salifert nitrate test soon as possible now. It is weird though every zoa in my tank is doing good besides these ones I have been getting from fish store.