I am in the process of converting an aquaclear 300 into a plant filter. I have the filter filled up with gravel and it is fed by some tubing running from my fluval 104 to the bottom of the filter. The water flows up through the gravel and out the regular spout into the tank. I do not know of any plants that grow well with their roots submerged and the rest above water. I live up north so local plants are out of the question. I have herd that bamboo may work. One last thing, will this filer enhance my water quality more than I had not converted it?