[Solstice]

confuted,
One of the nice things about EI and why I chose that dosing method is that it doesn't really required you to test your water as much. I haven't tested my water, with the exception of pH, since a week or so after I started this tank. The idea is to provide enough ferts on a regular basis that you won't run into a deficiency, and then to do weekly water changes to flush out extra nutrients. So, I can't really answer your nitrate question, but I can tell you that EI works and works well. You will need to recalculate the amounts based on your tank size, but I wouldn't do more than that. You can find out more here: EI in 21 Days

I don't refrigerate my nutrients at all. They just sit in a canister in a cabinet (no light, usually) and I've never experienced any kind of algae or bacteria issue. Freezing is definitely not necessary.

actioncia,
No problem, my friend. I've gotten a lot from this community and will always do what I can to give back.