I just collected about 1.5 pounds of milfoil from a local reservoir, and I was wondering how well it does floating in an aquarium? It will be with native fish, so the tank will be unheated, and im just going to buy 2 40 watt lights designed for plants for the the 125g they will be in. I figure if there floating then maybe I wont need as much wattage per gallon since they will be so close to the lights, is this a good assumption?