I just bought my second THE BEST regulator from AquariumPlants.com. I am very happy with my first one so I bought the second one. But as soon as I set up everything and trying to adjust the bubble rate I realized that it was not performing right comparing to the first one. When I slightly press on (not turning) the needle valve the bubbles rate would slow down quickly or stop,so adjusting the bubble rate becomes difficult but I get over with it. Tonight I shut off the regulator and 5 minutes later the bubble is still coming out at a very low rate maybe one bubble every 3 seconds, and it's still going right now. What could be wrong with this regulator? The needle valve? The solenoid? How did you guys get warranty from them? Can you ask them to send a new one and return the defective one when you get the new one? Obviously I need the regulator to keep the tank going. So far there is no fish in the tank so defected regulator is ok. I won't bother to email them maybe will call them. If there is a way to fix this I will do it myself instead of mailing it back.