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When you say acidic, what exactly? When you flushed did you feed straight after? Why were you measuring the run off ph in the first place? Was there an issue that caused you to do that?

Let the plants finish. Get as much weight as you can, because there's going to be the same amount of seeds regardless and if anything they'll might be easier to spot when the buds are fully swollen vs not.

Looking like 110w per glixer 100w per GL And I 300w for the king led? Do you have multiple of these lights or is the bracketed number for something else?

Do you know the real wattage of all those lights? Personally I'd put them all above.

No point guessing , anything could happen from this point

It's nonsense. Photons travel in straight lines. The amount of photons making it through that gap at the correct angle is miniscule. But if you want peace of mind the solution is a long cardboard box the width of a door with a slit on the lower part (door side) and a slit on the higher bit...

If you can fit in extra light then do it

Pics

Agree , light under a door isn't going to do anything, unless the issue is light from in the room coming out into the hall? Anyway, just Google light baffle or light trap. Then construct something that you can tape to the door . Though I don't think it's necessary. I have open vents on my...

Are you planning on continuing mechanical extraction as a way of controlling the environment? If so, where's the air going to come from to replace extracted air?

Something is wrong with your set up or methods if your whole house smells. Mine doesn't. None of them ever have. I oversize all filters, pump the air out of chimneys . Wear grow room cloths and gloves when handling plants , that don't leave that room.

I use two pipettes of 85% phosphoric acid in 20ltr of water to take it from 6.8 to 6ish

You need a reality check. People have been growing with HPS for decades. So the idea it's the HPS fault your plants hermed and not poor genetics or poor environmental control is crazy. Also, houses are generally at a reasonable temperature unless derelict. Your also not considering that under...

You generally use your house air as intake and remove the heat via window or chimney. My basements too cold in winter without adding heaters, rest of the house is fine. But in summer the top if the house is mafting. But just about manageable with good extraction. At the end of the day, if your...

You'd just be throwing away the whole crop and costing yourself a lot of time. Get PayPal credit or something and get a light. But at week 5 you've already diminished your harvest return , if they've been under lit all this time

That's just dryer hose. It's possible it's gas permeable. Get some proper duct and if it's a major issue add an inline filter too

Main thing is the temperature drop Your running at barely 70f. But you've also reported and topped..in an already stressful situation

You aren't just a bit out. Your massively below temp . You need to insulate that shed, at the very least the ceiling. What size tent is it? With exactly what lighting?

I think you might of been feeding without a full nutrient profile. Lacking iron /sulphur, due to you not having a proper base nutrient Assuming your roots are OK as you said

Sulphur is anti fungal and has anti bacterial properties . Spinosad is a bacteria. So don't mix the two