Hey guys, new to the forums . So I have a 10gal tank with an undergravel filter. It's powered by an older air pump with double air outlets. The tank has two air uplift tubes, one on each side of the tank. I've added a homemade filter to one of the tubes for extra filtration- so instead of bubbles flowing to the surface, they flow through the filter, then to the surface. Now I understand how UGFs work, and I know they work more effieciently with a higher flow rate. Here's my dilemma: I'm thinking of sealing up one of the uplift tubes, and placing both air stones under the uplift tube w/ the attached filter, and adding an extra air pump rated for 10gal tanks. Thus, the end result would be two air pumps w/ three air stones bubbling under a single uplift tube w/ an attached filter. I'm guessing there would be tons of bubbles flowing through the tube and filter to the surface. Would this be overkill? I'm thinking with more bubbles, there would be more air lift, which would cause a higher flow rate, which means more water would be cycled, which means more filtering efficiency, and there would be more oxygen in the water. Would this harm the beneficial bacteria in the filter? Would there be too much buildup of bubbles for a small tube? Would the water flow too fast and kill the efficiency? Would the other side of the tank have less beneficial bacterial growth? Would this idea work in the long run? You don't have to answer all those questions, I'm just looking for your insight and opinion. ANY input will be appreciated, thanks much. Please note that water turbulence isn't an issue.