I got those same bulbs and stuck them in my 10g tank. They never seemed to grow, so after about 2 months I basically forgot about them and stopped watching them. About a month later (3 months from placement) I went out of town for the weekend and when I came back all 5 of them had sprouted at once. Scared me for a second because I forgot about the bulbs being in there and was wondering what reddish alien being was growing in the tank.