i want to buy a dosing pump, if im going to get one i know i want to get the 4 pump because ill eventually upgrade to it if i buy a two pump. so i see the jebao DP4, for a good price. i have never owned one and never even looked at how to set one up. is there an easy way to do this? i should also add i eventually will purchase an apex. so i want one that can link, if you have any suggestions im open to ideas. thank you