[url=http://www.fishtanksdirect.com]Acrylic Aquariums & Acrylic Fish Tanks by Fish Tanks Direct[/url]\r\n\r\nI needed to order a new heater so i did a google search and found one at fish tanks direct.\r\nIt needs a controller and this is stated in the product description. You can buy the one made by the same company that makes the heater element but i have an RKL so i just bought the heater. I got a call later from the company to make sure that I knew it required a controller. He said some people don't pay attention to that. I told him I already have an RKL and he confirmed that would work fine.\r\n\r\nI just thought that was cool that they actually took the time to double check with me before shipping out the order. Most places don't pay attention to that and just take your money and ship.