It is in a 10gal with 80 watts of pc. I have had it almost a year and it had lived through months with out water hanges and weeks with out top off. It has also lived thought a power outage where the water temp was below 50* for about 12 hours and just the other day I was changing light bulbs and dropped the lights in the tank. It looked like that was going to be the end of my tank all together but everything pulled through. I read all the post about the bad ones just thought I would post about a good one.