I have an aquarium I am using to grow marginal water plants, so there is only about 3 inches of water in it. I am wondering if anyone could recommend a grow light bulb that really improves plant growth. It would have to be one of the short bulbs that screws in and under 25 watts. Currently I am trying an Aqua Glo but is there some in the size I need that would work better? Thanks! Pat M.