Check for salt buildup on the connecters. I used to have T5's pretty close to my water and had lots of buildup that would eventually cause the bulb to trip the GFCI. I cleaned mine with fresh water, i'm sure there's more electrically safe ways to do it.
If not that i had the same issue with my fan. it was a 120V fan that came on at the same time as the lights, and really threw me for a loop when i cleaned my T5's and still had problems. Same thing with water/salt buildup, this one was actually rusted so i didn't bother cleaning it, for $4 at walmart it isn't worth the time :P.
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