[I added my regular seachem products last knight and added buffer yesterday because the PH was low (7.2) but alk. fine, calcium 500 nitrates low. This morning the PH was so low it wasn't readable on the jungle test strips (it turned brite yelllow) ouch. When and what seachem products should I use and do buffer at night or in the morning. The directions sound easy for beginer on seachem products, But when should I move to novice when I don't know exactly. I really don't know exact gallons of because of live rock mixture of carribean, fiji and orther live rock? Do any of you have some sectrects using these products. MAIN QUESTION is what would have caused it to drop so severly and quick was it the corraline and sps using lots more calcium than was in the tank before dosing and testing last night? HELP!!!!!!!!!!!! ???]