Hey Curly. I have a total of 12 Air outlets, coming from 3 4-outlet pumps. Originally, I had 1 4-outlet and 1 8-outlet but the 8 one got destroyed on the shipping over here. Luckily, the store sent me 2 4's instead. I have 10 DWC with 1 airstone each, and the water-farm takes 1 for airstone and 1 for top feed. It works out good, but I Have to move plants around in sets of 4; which is no problem since that's how I planned to do it anways. When it comes to air, I suggest trying not to cheap out at all. We spend so much money on our lights and nutrients and seeds, that some never considering spending the extra 50 bucks for a very nice air pump. The more air you have, the better, especially in hydro units. Helps protect from root rot, pythium, etc. I wouldn't suggest using a 2 prong air pump to run 4 buckets. I would suggest using that pump to run one bucket, maybe two depending on the size of the pump. Do you have a picture of it? A new pump to run 4 buckets very nicely only runs around 25$. Check em out.