HI there, I came home today to find my heater was spent and no longer working. I need a replacement as quick as possible. I live in a small town and none of the superstars or the local fish store had suitable heaters. My only option is buying a heater too big or ordering on online. I was wondering if it would be acceptable to buy a 75 gallon heater for my 55 and just turn the temp down so it won’t overheat my tank. Any thoughts? Let me know, thanks a lot!