I was trying to research my suggestion just now and stumbled upon this disconcerting thread on the 30" coralife t5no... Hope yours doesn't encounter problems like these guys...
Edit: so after skimming a few pages on that thread, I'd recommend, since the LFS
won't take it back, try to determine when your fixture was built. Apparently the older units, which can sit on a LFS
's shelf for years, have design flaws that can burn out bulbs, stop working prematurely, and/or melt the splash guard. The solution, if you have an older model, is to contact Coralife directly and try to get a newer model switched out.