I have a 20 gal. Sea Clear acrylic tank with a 20 watt 24" fluorescent light fixture. It's been running a GE Plant and Aquarium bulb for years now without any problems. I just bought a CORALIFE 50/50 bulb and it won't work properly. The light will just blink continously. Do these 50/50 bulbs require anything special? More power? Can I modify my fixture in any way?