hows it going, i have the 10g kit from walmart, it was my starter kit, and ive since planted it with incandesence bulbs, and was fine with almost any low-medium plant i put in, even jungle val did well if it was not covered by something. i have decided to up the wattage, and go with heavey plants, so i bought a 25 watt 50/50 bulb from work (big als aquarium service) tried to put it in, guess what, didnt fit, the ballast was too big.
SO, i decided to rip out the rubber part that prevents water from going into the fixture, and it fit perfectly, all i did was put a peice ov pvc pipe (half a peice) over the socket part with some tape to prevent water from going in. the tank is working great, and i only have one builb in there for now (i actually blew the other side before i replaced the bulbs) i even know some one who has done this and kept coral.