Welcome to our forum.
The chems are a little confusing for the first few days. After a week you'll feel confident. (Then after a couple weeks you'll realize you've screwed up the chem part the first 2 weeks and THEN really get it. Someone called the first couple weeks "the mad scientist syndrome." It happened to me - no big deal)
Our new optima will be here Friday morning. All is ready for its hook up. Any last minute advice ?