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.
9-10. It will slowly vary, maybe .2 change a week. Usually 9.4
I read a study that showed carbonates are the limiting nutrient in coral growth in typical seawater and conditions, so I keep mine to the high end. Not sure if it actually helps (statistical significance in a study doesnt always equate to clinical usefulness...)