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You may want to super crop or bend the tops down a little at a time to even out the canopy and give them some room for stretch. Like nutty says, those plants might double in size during the stretch.

This may be a situation where flushing is recommended. At least try adding some cal-mag :)

Gnatrol or mosquito bits for the larvae. Sticky cards for the flying adults.

The rh rises when the air gets colder but it may be fine in the grow room From Google: As air temperature increases, air can hold more water molecules, and its relative humidity decreases. When temperatures drop, relative humidity increases. Have you tried bringing the fresh air in and see how...

I'm not an electrician but I can tell you that a 15 amp circuit at 120 volts can handle about 1440 watts with a safety margin already built in. That Mars LED is rated at about 135 watts so you really need two of them to light your space. Add your light wattage to the wattage of the other devices...

Tough call but lighting has the edge IMO. Dialed in VPD with poor lighting would give you poor growth but good lighting and imperfect VPD can still result in good growth.

How is your temperature?

Agreed, you still have lots of white pistils standing. You will see amber trichomes on the sugar leaves so make sure you're checking the calyx.

Either option is about 200 true watts but a 2x4 really needs 240 to 280 watts (based on 30-35 watts per sq ft). If you start a little low, you'll probably want to upgrade after a while. Best bet is get what you need the first time (IMO). If there's anyway you can get the qb 135's you'll have...

Two lights gives you insurance too. if one light fails you can get by for awhile on the other one.

Too much heat can affect the quality and weight of your buds. Try for mid to high 70's F for HPS lighting. What is the distance from the canopy to the lights? Lights being too close will hurt your buds too.

It would help to see the whole plant and a couple of bud shots.

Good advice from Richard. First thing I thought was poor drainage, make sure the pots are nice and light before adding more water / feed. For drooping leaves on one side, make sure you don't have a fan blasting that side of the plant. The pots look a little shallow to me too, need plenty of room...

I noticed the headless trichs too, maybe just from the trimming scissors or a trim machine? You can try opening up a bud and looking at the inside.

Yeah, let them dry out until the pot's nice and light.

Maybe a little too much water but I'm just throwing it out there, I'm no expert. 1st photo looks a little wet around the stem. Try to water around the drip edge and let the roots reach for the water.

It's wasn't a fair fight because I upgraded my lights at the same time that I switched to canna coco. But, I think I'll stick with Canna for a couple of grows.

Agreed, too strong on the nutrients. The dark green leaves with the tips curled down is a sign of Nitrogen toxicity.

That worked for me although I added the pk 13/14 for week 5 and also boost at about 5ml / gal in flower. Do you use a&b at full strength according to the canna coco dtw feed chart?

You mention gh trio nitrogen and bloom, what about micro?