Hope everything is goin good with the grow....Was just checkn back in to see if the predetors did any justice or if the mites are back in full effect?I also had a question i been asking around about and wanted to hear your expertise on this subject..I have a completely sealed room other then exhausting the lights..I have a watercooled c02 gen running at about 1500 ppm with lights on...In the dark period i have been seeing high ppm readings all the way up to 1700 ppm..I have never seen levels this high at night..My room must be very well sealed to be building up these levels from the plants producing co2 at night...Anyway hears the question.....How detrimental do you think these high nightime levels are?Are they not getting enough oxygen at night with these high levels?I was thinking about exhausting at night but never had to before in a sealed room,,It kind of defeats the sealed room purpose..I also tried cutting off the gen an hour before lights out but the levels are still high in the middle of the night...Also this is a hydro grow and plants seem to b looking fine.........Anyone feel free to chime in on this if you have any input on this matter....
I the predators helped, I couldn't tell. We're back to spraying. I've found that the Ortho Petrolium Oil works the best. It actually kills the eggs. We alternate that with Aza-Max, and a Pyrethium bomb in the Veg room every 2 weeks. We stop all spraying 3 weeks into bloom. We're hoping that the new plants will have enough oil on/in them to deter the mites in the last 5-7 weeks (the Laughganis take 10 weeks).
I have had the exact night time CO2 problem. I chose to vent at the start of lights out. But, I'm not sure if it was a problem. I would worry more about any time you have elevated CO2 levels during lights on...even an hour. The plants get addicted to the highest level they experience. If you ran 1500 ppm, and then went to 1000, your plants would grow slower than if they never had CO2 at all. I learned that first hand. So, the 1700 ppm time could be getting your plants "used to" that level, and then not maximizing growth during the 1500 ppm times.
My commercial growing buddy did a great test to prove this. He had a 2 room flip for blooming. One room he ran at exactly 750ppm during daylight. The other he ran up to 1500ppm, let it drop to 1000ppm, before running back up to 1500ppm. The 700ppm room grew MUCH faster and bigger. Since then, I've always just used 1000ppm, but used equipment that would keep every part of the room exactly at that level. I had 4 meters in the room, and kept adding fans and changing fan locations until I get every meter reading the same. I don't feel that one meter is enough. At least not enough until you get your air movement dialed in. Fortunately, I have access to several meters from a friend. Given their price, it could get expensive. When we seal the room in June, and add CO2, we'll use several meters to achieve consistant levels.
Anyways, I think it's up to you. I'd see how much extra gas you're using if you vent the room at night. Or, if everything is rocking perfect, why change?
Which water cooled gen are you using? Are you using a water chiller? How big is the gen? How big is your room? How much gas do you use? Cost? I'm in the market and like the water cooled units. My buddy says they suck, but he hates anything newer than 10 years. Sorry I couldn't give you a better answer. Maybe someone here knows if the high night levels are bad. I know that I'm going to use my CO2 to BLAST the mites with some insane ppm level. I want to find out what levels will kill a mite and what level damages a plant. I hear that it's the best way to kill every single live adult mite in the room.