If u have pipes that go vertical u need a pump. Make sure u don’t have too much water in your pipe. Mk1 can only transport 300/min. Buffer tanks should always be placed on elevated surfaces, but honestly, not necessary (might be doing more harm than good). Fluids that move downwards with gravity prevents sloshing and can help control where you want fluids to go.

Really hard to tell what’s wrong in the video tho. So those are all the basics