i want to know if i should keep the skimmer on 24/7 i've heard it will take up all the good stuff or leave it on for only a few hours a day. does it really mater.
You are going to hear lots in this hobby. You have to determine who has the knowledge and experience worth following. Have you seen any study that shows that skimming removes 'good stuff'. Just look at the cup of any good skimmer and you know it is removing bad stuff. So do more reading and make a decision.