Just got a new stemless disk diffused to 13arm perc from Dr. Lee. Its a great tube with amazing diffusion. However ive noticed that after anytime i take a rip from it the water gets pulled into the tree because the stemless still "gurgles" a bit. At times it will even pull water down from the perc chamber into the bottom chamber. Does anyone else have this with their stemless? If so, how do you combat it, its a minor annoyance, but an annoyance none the less.