So the 55g I got for Christmas has a bad ballast on one of the light hoods. It will come on about 10% of the times we try to cut it on. Has anyone ever gone through this? Where can I find a replacement hood/ballast for a 18" flourescent? I want the hoods to match, and the other one works fine, so I really don't want to replace both if I don't have to. Any suggestions????