I have a 20 gal
standard tank newly set up. I have a Tetra Whisper 20 pump and two Top Fin Fine Bubble Air Stones attached with a T connector. One of my stones has great bubbles, the other has very little when submerged at the bottom of the tank. It does bubble a little when it is just under the surface of the water. When I crimp the bubble stone that is great then the slow one is great. I have the same length (2ft)of tubing on each and a short 2 inch piece of tubing from the pump to the T. I tried shortening the tubing to each stone but it did not help. Do I need a bigger pump to run these two stones? Any advice is appreciated.