thats normal, don't worry about it it doesn't need to gush out. When stealth hydro first came out they had stronger water pumps but they got better results using the 200 gph pumps they now ship with, the less pressured helped to get more oxygen to the roots before they're hanging in the res. I've been using this system for a while, and have built a few of my own, it's a good system for beginners. Happy Growing!