I know which tank and light. It will not grow much, not very quickly either. One of my old room mates moved a desklamp over the tank and iit grew wisteria like none other. He had some moss and I think a wendtii crypt I had given him thriving as well.
Okay. I guess I shouldn't say I know. Is it a tetra brand 8ish inch cubish tank with an 8 or 9 tiny led lamp on a curved arm?