thanks, hoppy. Any thoughts on a siesta regime to increase co2? My (limited) understanding is that the co2 level goes down to almost 0 after the first 5 hours the lights are on, and that shutting them off for several hours brings the co2 level back up significantly while the plants respire. In theory, this regime would provide a little more co2 for the plants. I'm wondering if anyone has any data on whether this works or not.