Steph, I just started having the same problem last night with my 29g. In the past 24 hours, it tripped 4 times. Once while we were sleeping, and once today while I was at work. After mowing the grass, I yanked mine as well... I may go and get a GFCI breaker for my box, as well. This is a dedicated circuit, and nothing has changed in the past week or so, so I don't know what the dealio is... of course, I could have a bad electrical component and just doomed my house to burn down :/