I'm dumbfounded now. I just put 2 more pepps in the fuge. That made 4 out of 5. I just glanced over at my tank and saw three scurrying around in the display. What is going on here. I've got a directional u-tube on the return line (if they were to somehow survive the trip through the pump) which leaves the overflow line left. I cannot, for the life of me, imagine them crawling back up overflow tubing, into the box, uphill again with less water to swim in. THEN going the wrong way thru the u-tube and back into the display. Second thought is they had babies that grew instantaneously which is just as crazy as the first idea, especially since I am still only counting 5 peppermints in the sump.