I have a 36" 1 x 96 watt CFL fixture. I want to use it on my 15 gallon tank but its obviously too long. I noticed that Coralife sells a 1 x 96 watt quad bulb that is only 17" long. Would it be possible to use that bulb with my current fixture ballast? The only difference is that the quad bulb is a square pin and the fixture is a straight pin. I figured I could just swap the endcap on the fixture and I should be good to go right? Thanks.