My experience with nitrate filters is that the water flow needs to be so slow that it's useless. To be of any use it would have to be 1000 times larger in scale.
Keep it simple and life is easy :-)
Project Update...........system is almost ready, I'm very excited Fish_Tank_9.jpgFish_Tank_10.jpeg
How did you make out? I am looking to do a tank this size or slightly larger and love the idea of the constant drip into the sump. Did you end up installing this?