Lanterns, flames, hibachis all seem like a good idea until your house burns down. Use a special CO2 generator if you don't want to worry. CO2 tanks work well for small confined areas, but for bigger areas a generator is the way to go. Once you have the regulator hooked up tyou need to connect it all to a release solenoid, just time the solenoid to go off at the correct intervals to create a 1600PPM CO2 environment. A proper CO2 meter isn't cheap.