I have a Eshopps Skimmer from Aquarium Designs, and it has a rio 600+ rated at 200gph. This thing isn't producing the bubbles/foam/skimmate I was hoping for. It consistantly has produces wet skimmate when I raise the waterlevel to right below the foam chamber, but I think it should be working with the water level a little lower. I know it isn't the best thing out there, but I know it can do better. What might be an easy way to increase the amount of bubbles, or is there another pump out there that would be worth replacing the rio with?

This thing is in 3 gallon chamber of a 10 gallon sump with water coming directly from the tank into it.