anyone who doesnt have a ato should get this and if your thinking about changing or upgrading it you should buy one of these

its the most fail proof design ive seen and its not too expenxive less than i paid for my jbj ato

it uses air pressure in the tube to trigger a pneumatic switch which in turn relays the pump on and off be benifit is if a snail or calcium gets built up on it it will still function properly the only way i could see it failing is if a rat chewed a hole in the pneumatic hose i think i will be ordering one of these after i buy a apex controller you can even order it with the apropreate plug for your reef keeper 

http://www.avastmarine.com/ssc/do/product/rigging/Top-off-Kit