This is definitely my first time setting up one, but it didn’t take that long (so far) to be honest. I just looked at where the saltwater barrel was in my basement. Where the tank was? And then figured out how much RO tubing I needed, where I wanted to put the dos (I put mine in almost the middle between my tank and saltwater barrel). I also bought a random pack of RO fittings on Amazon. Then I ordered everything else on BRS and saltwateraquarium.com.Any advice? I need to do this but just have not made the time.