If you want to regulate the flow out of the red O2 tank you could add a needle valve between the stone and the O2 valve. This is an inline Oxygenation component I'm going to incorporate in to my system. I'll probably keep using the red tanks for now, I'n already vested in to using them. If you really wan't to go that route too, Williams brewing has the regulators on sale right now for 14.90
