Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
That would be a problem as well. Go pick up some calibration solution for the refractometer. We got in trouble by using RO water and setting it to zero, even that was not good enough.
Alk gets absorbed into corals a lot quicker than calcium so that is why it swings more. Calc and alk have a seesaw effect (if that makes sense) so yes dosing calc is necessary or you can really drive your calc down and your alk up.
What the others said above is correct. Also, depending on the chalice, it can change. Some of the thin skin deep water indo ones have to be completely in the shade or they will bleach out. Others can take a bit more light, but generally they are down in like 200 par areas.
Do you use and rodi unit? Did you change anything else but the salt?
It sounds like something was poisoning the inverts and the corals which could be copper or some other contaminate. I would absolutely switch back to reef crystals if you think the red sea coral pro was an issue.
The 90...
If you jump on Ebay you can find them real cheap, just don't know how good they will be. No idea on the goosenecks, but the reputable ones seem to have no issue holding the bulb.