I was talking to a friend of mine about nutes. my question to him was if i have a 10g res and i have 5 different nutes im using,ex a, b, c, d, and e. each nute says 2tbs per gallon. so i add 20tbs total. he was telling me that i add 2tbs x 10(for the 10g) adn do that for all 5 nutes. that means...