Well, that could be a problem there. If part of the reflector is hanging off of part of the tank than you might be losing quite a bit of light. If it was my tank, I don't know that I would keep that fixture, moreover switch to either the original PC
hood, or either an HQI hood designed for that tank, or I believe there are LED
hoods for those now. But as it is not my tank, the choice is yours. Someone with more experience in the lighting category might be able to help you even more.
Post is pretty badly organized, so if you need any clarification, just ask.