my zoas are not looking too happy :(

my water test are not showing anything really wrong and my acans seem to be flurshing.

amio 0
natrites 0
natrates round 5-10
but my ph seems to have dropped off a heck of alot when i swiched from using tap to using water from a windmill. right now before the lights have come on it is sitting at about 7.6-7.7 i would guess from the test this morning. My cal is a little low also i think it was running at like 380 a couple days ago.

would this be what is stressin them out? any other suggestions? i was thinking about drippin some kalk but i have never done this before and would have to figure out a way to drip it with a milk jug or somthing.