about 20 minutes ago i woke up to my jack dempsey of 4 years dead in her domain. really sucks, she was such a beautiful fish. don't know how it came to be but the heater seems to have bursted, has anyone ever seen a heater just break for no reason?? So if a heater breaks in your tank does it just shut down or does it shock your fish?? my guess is it shocks the heck out of your fish. sad day, R.I.P. Jackie