Strawberry Cough in bubbleponic SCROG

18/02 - I've completed my homemade SCROG frame. Really easy to make, just 25mm PVC pipe and 2mm paracord with screws and epoxy for fixings. The only specialist item I ordered was four spare corner brackets from a Secret Jardin space booster - bars which some people put across the middle of their grow tent to stop the sides from being sucked in by their extractor fans - and these only cost me 2 Euros each... unfortunately it was about 20 Euros all in with shipping! Nonetheless, really happy with the final product. I applied "Plasti Dip" (liquid rubber) to the pole clamps to provide additional grip, but this thing is solid as a rock even without it. No chance of it moving anywhere for the duration of the grow (unless I want it to). The net itself covers 95cm x 112cm and gives me room to access under the back two plants from the side windows. The individual squares are 8.5cm x 8.5cm (3.3" x 3.3"). I haven't seen anyone else make anything like this during my research - everyone was either making legs for their frame, hanging it from roof of the tent (??), or tying it on with cable ties and the like, so I'm feeling quite pleased with myself for creating this strong floating specimen which feels like it was made for the tent. Upon installing the SCROG net I've realised that my lights were 6 inches closer to the canopy than I had previously believed. I now think any "nutrient burn" I saw last week may have been light burn. Hopefully now I can push ahead and increase the EC again! I've also done some minor defoliation this week - just removing any leaves that were too close to the substrate to improve air flow around the stems and also prevent bits of leaves falling into the pebbles. I'm not someone who likes to perform major and regular defoliations as I believe in tucking and not stressing the plant wherever possible for the biggest and quickest yields. The Exhale CO2 bag arrived. Obviously it's still in it's infancy, so it wouldn't be fair to test it as yet... However, the CO2 meter I ordered from China has also arrived unexpectedly early. I've calibrated this outside today and it seems legit - very nice little meter and I believe it's quite accurate. I've added photos above of the outdoor reading (~400) and the one in the tent sitting directly under the CO2 bag - and the reading is showing as >700 (and it later topped 850)! I tested it in an empty room next door and this was showing at ~430, so it's definitely helping to up the CO2 in my grow room (which is tiny and mostly filled by the tent itself). I do exhaust this tent, but only into the room itself and there is a small window open to encourage a bit of air flow/let condensation out, so it is not a sealed room by any means. The extraction fan is currently set to a low speed due to both low temperatures outside and me wanting to keep the humidity higher during veg, so I don't know how this will effect it in future once I flip to bloom. I don't think it's fair to judge this either way yet, but the CO2 bag is only two days old and there's only some small patches to mycelium visible - whisper it quietly, but this might actually work and get the grow room up above 800 regularly once it's padded out! I honestly thought this might be snake oil. Will keep you updated on this moving forwards. 21/02 - Full reservoir exchange completed. Easiest way to do this in a Wilma/Origin drip system is to pump the water out the reservoir, although this will leave some small dregs at the bottom (<5%) which the pump can't reach. I therefore filled the reservoir again completely, then promptly pumped it all back out again to ensure that any "dregs" that remained were heavily diluted. The plants are currently drinking approximately 10L every two days at this point, so I expect I will fully replace the 70L reservoir again within two weeks. This is perfect, as I am planning to flip to 12/12 in about a week's time. I will then continue to tuck the branches under the SCROG net for another 7-10 days - at that point we should be looking at the flowers starting to show, so I will then do another full exchange of the reservoir and add in my bloom nutrients and PK etc.