Has anybody tried fitting a solenoide switch to DIY CO2? Would it be possible to set up a T Joint in the tubing one end to the tank and the other to a solenoide valve. Then just run the valve timed in reverse ie. open and dumping the CO2 at lights off and Closed allowing the CO2 to go to the tank lights on? Also would a simple anti siphon valve be safe enough when the Valve is open to prevent emptying the tank? Anyone got any thoughts on this? Thanks Paul.