Guerillagarden said:

Hi my plants are 34 days from seed a few are a couple of weeks older.. the first 14 days they were growing super fast but th last couple of weeks seems a bit slower and the leaves don’t feel waxy they feel a bit papery and some of the stems are going a bit firm. I’m in bio bizz light mix soil feeding bio bizz nutes and a little superthrive..they are fed on a rainwater and dehumidifier water mix but mainly rainwater I bring the ph down to around 6.5 -7.0 using vinegar they are on a light schedule of 19-5 temps don’t drop below 24 c light on and not below 20 c light off and humidity stays between 60-80 percent. the light is a adjustawat 720 led on 25 percent about 2 ft away and they seem to look worse about a hour before light goes out. Any ideas anyone? These pics have been taken at diffent times over the past 2 days

Click to expand...

A few closeups

Howdy grower. Are you saying you are having to downward adjust your rainwater and dehumidifier water to get to 6.5-7.0? A couple things... first, I am very suspicious of the accuracy of your pen. Rainwater and the water in your dehumidifier are going to naturally sit somewhere around 6.5, there's no bicarbonates or other things in it to raise it higher. So first of all, your pen is probably way off on its calibration. The other thing is I would recommend you steer clear of using the dehumidifier water, it is a breeding ground for pathogens that can make your plant sick.

That said, I don't see anything indicating there's any pH discrepancy. Immobile nutes aren't really acting up, might just be hungry for a little more nitrogen.

If you are going to pH adjust your input, aim for 6.5 which is smack dab in the middle of an optimal range of 6.0-7.0, and from there you and custom tweak the input if needed based on output. For example if you're clocking 6.8 with runoff you can adjust input to 6.3 because you're trying to bring it down a little.

Yes. Adjust the water pH as close to 6.5 as you can get it. Test it after any amendments have been added to the water. I also see some signs of a need for more nitrogen. There are a few that look like they could use more magnesium, as well. The plants frequently need more of it when they start flowering. Otherwise, your plants look healthy to me.

What light are you using? How much power does it have?

Cal Mag and up the temps