Dumb bass mistake with CO2

Man, I can't wait until my CAP ppm-2a fuzzy logic controller comes. The 1st one I got had to be sent back for replacement. Since then, I've been turning the valve on my CO2 tank and letting it go for about an hour at 5. I have tested it with the norm sryringe and test tube and get just above the 1000 mark reading.

Anyway, I totally screwed the pooch and got too fucking high and forgot all about it.3 hours later, I immediately realized and ran towards my grow room. I left the door wide open to air it out and took a measurement within the grow area. The test tube was all Purple past the 5000ppm mark!!! This was about an hour ago (I had to smoke even more to relieve the stress lol) and only my oldest plants show signs of leaf curling and slight drooping. I now have it right around 1000 ppm after airing it out for 30 mins.

I imagine they will be alright. What do u think?
 
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