i have the homemade co2 set up, but at the end where the bubble wand is and the co2 comes out, theres a slimey like milky looking goo that builds up on the wand. i checked to see if any of the liquid was goin into the tubs but its far from it. any ideas what this is? is it bad? the fish seem to be happy and dont seem like anythings wrong. i took it out of the water for now. thanks