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I woke up to my 40 gal FOWL with all my fish dead ,a flag fin angel who i raised from the size of a half dollar ,a large clown,and a yellow tail damsel,all these fish i had for over three years,all dead exept the clown who was on its last breath,all fish showed sins of extreme gill flare.when i went to take them out of the tank i got a huge electric shock up my arm .the fish had all been shocked to death . i inspected further and found that my heater had a crack in it .it was an 150w visi-therm (piece of sh......) .the heater had not been changed since set up .and i was wondering if anyone had changed them yearly ect?had any problems with this or any other brand of heater....... 