frenchie, I appreciate the advice. I'm going to eventually spend the money on RO / DI since it is the only cost effective alternative. I don't have it now since I spent it on my skimmer. I don't have any algae issues as of yet. It sounds like I will eventually have one (if I don't start using RO), but for now it will have to wait.
Kenfuzed - I am topping off less than 5 gallons a week on what is something like 140 gallons total water (tank = 120, sump = 40, skimmer bucket = 18, less live rock).
My skimmer seems to skim wet (not sure its stable its only been running 4 days) when running wide open. Its in 10 inches of water (IN-250). Does anyone have any easy plans for a skimmer stand? I'm thinking I will stack egg crate on the bottom untill I'm happy. I'm not sure how much height egg crate uses, or how much height I should get rid of in a shot. I'm going to wait until its been running at least a week before I deal with it, so I have time to figure it out.