I have a set of very intense led lights on my reef tank. I now have them set for auto on/off-extra 40.00! yey-it works! Then I was trying to figure out how to cool the fixture as it was getting really hot to the touch and adding heat to the tank. I googled the ad where I bought the lights and found you could purchase separate fans. Based on my light size, it needed three. They come in two's but one is designed to plug into, you guessed it-the place where the control plugs in for auto on/off. So, I had to purchase three sets to get three cords. They are now plugged in and the temperature is reduced-the site even tells you fans will prolong the life of the fixture. An additional 90 dollarst. So, my 250.00 lights were almost 400.00! Sort of irritated that all this did not just come with the light! I do not know about you, but I hate paying for add-ons that should really have been part of the package. Thoughts?