what am i missing ???

So ive gotten this far with just composted horse manure that’s been sitting for a few years.
recently started showing signs of some deficiency.
gave it some mg (1 tbs to 1gal) last week Some leaves have gotten worse.

Buckskin8 said:

So ive gotten this far with just composted horse manure that’s been sitting for a few years.
recently started showing signs of some deficiency.
gave it some mg (1 tbs to 1gal) last week Some leaves have gotten worse.

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Have u been PH testing your water? Could be suffering from lockout.

Looks like they're getting burned from the manure to me. I would replant into some good soil.

What is in your medium besides "horse manure" and how much did you use, the ratio?

looks like early stage mag problems. i've never grown in horse compost, but a quick read online suggests that it is stronger than cow manure compost, and should be mixed with some other medium and not used straight. in the future i'd cut it at least 50/50 with some good top soil or potting mix, and then use some good quality nutes during flower, when they plant will have pretty much depleted the soil in its pot. or you could start top dressing when you flip to flower, watering in kelp meal, alfalfa meal, blood meal....