i like the quote of what bro solo said to me when he saw i kena this shit....our tank is like a time bomb.... u may find ways of preventing tank from overheating, but what if the controller nothing wrong, but chiller pump jam or main return pump jam, or filter too dirty causing overflowing of water or maybe something shorted in ur house causing power trip. from this issue i encounter, i guess if we wan to reef, we need to be prepare for such a day. anything on the tank can fail on us anytime....