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I would transplant those plants to new fresh soil , the pot look too small for the size of your plants, you can correct many problems by just transplanting to fresh soil, then check for the new foliage output, if it's green and healthy you are on the right track

For me this is a case of nutrient lock out because you gave them the wrong ratio of fertilizers, it's not a PH problem it's just too much phosphorus causing the lock out, check "nutrient imbalance in plants" on Google, the correct ratio of nutrients is key to leaves and ultimately flower...

Those marks are bugs, you can use Neem oil if you wanna go organic

canna flores, calmag and bat guano? It looks like a nutrient lock out, you used a wrong combination of fertilizers, too much phosphorus can lead to nutrient deficiencies like iron.