So, I am in the process of going through my RDWC system. I bought a nice pump to pump out the solution and built a new screen. Now I'd like to upgrade my air pumps and stones. I run a 6 tote RDWC, modeled after the Current Culture set-ups. Each tote is around 20 gallons and has 2 airstones. I have a mish-mash of "professional" pumps and hydro (plastic) pumps I bought at grow stores. So, I need at least 18 airstones for the grow totes and the reservoir. Can anyone suggest a nice pump or tow and some good airstones for this set-up?