Black spots on leaves again

I’m not up to speed on all the nutrient offerings out there that are turn key ready to go.
I grow using the organic amendments with a living soil where like outside in nature the little micro critters we can’t see work their magic with the plant and nutrients in the soil…
Many of the nutrient offering are chemically produced and they kill all the good critters and that sends the stuff you need to do more complicated regarding testing run off and flushing and all that.
Living soil if set up well will help self regulate the process for the most part.
If your interested in learning more about this look here
https://ilgmforum.com/c/soil-building
And here
https://ilgmforum.com/c/beneficial-microbes-fungi-bacteria
There is a lot of information that can help you if your interested in organic living soil grows.
Sorry I can’t be more help with the nutrient suggestions outside of natural amendments.

As far as soil Ph that’s another discussion lol versus the liquid Ph of the input (water +nutrients) and the excess water that comes out the bottom. The input Ph you want will depend on where your run off Ph comes out at. Your run off Ph target will be around 6.2-6.8 or so. So if you Ph feed water to say 6.5 to start and feed until runoff and then test that run off Ph and it’s say 7.2 then you will want to Ph the next feed to maybe 6.0 and then check that run off. Make sure you keep a log of this info to reference later because I know I can’t remember unless I do.
Then you’ll also use the TDS meter during the mixing of the feed after mixing check the PPM of it. 3 weeks into flower I would shoot for between 800-1000 PPM. Then also check the PPM reading of the run off too. That will give you an idea if they are needing more or less nutrients in the feed water.
A lot of this stuff goes away or is minimizes when growing with a living soil.

Here is a write up I did on a Ph Soil meter tester that I use

Hope this helps and HAGD