hi there Carl, you have the right idea with the top watering. Imagine putting everything on autopilot how much more you can handle, amirite? anyways usually you end up building it yourself with a few pumps , tubing and hand made rings. I dont know the chronchat system, but i've tried both bottom feeding and top feeding and i know top feeding works better, especially for things like soiless medium. so you're on the right track. hope this helps ! 🚀