I have a 5 gal for my betta, and it came with a 15watt incandescent bulb, but I would like to upgrade to a compact fluorescent. The tank hood says no more than 25 watts. Today, I got a 10watt compact fluorescent, and it fit perfectly; however, when I turned it on, it lit up and then immediately blew out. Anyone know what went wrong or have any suggestions? I know sometimes fluorescent bulbs have comparison wattage for incandescent equivalent. My tank is planted and I'd like them to get some good light.