gfi outlet occasionally trips

[fancyfish]

Hi
let me preface this with the fact that I know absolutely nothing about electricity. I did know enough to have the outlets for my tank GFI though. anyway on occasion without any specific pattern or reason my tank will trip the outlet and shut down. I have two tunze pumps my main coralife turbo-sea high pressure main pump, 3 magnetic ballast that run 3 150 watt MH and a ballast that runs 4 96 watt actinics. I also have a ozone unit and a aquamedic turbo-flotor shorty for a skimmer. why would my tank occasionlly without warning trip and shut off. It can run for weeks then all of a sudden shut off. Any help is much appreciated.
thanks
pam

 

[PJSea]

Could be one of your loads occasionally has slight current leakage to ground or more than likely it is your GFIC.
I had similar problems with an annoying trip of the GFI associated with running my PC lights. I could run all my other loads including 2 250W MH without problems, but when I plugged in the PC's the GFI would trip immediately or within 15-20 minutes.
I also tried separate , independent outlet and it also tripped the GFIC.
The problem was corrected by using a new(and different GFI) than what was installed in the house originally(which was only 9 months ago).
Haven't had a single trip since then.