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Hello, is it calcium deficiency?

Hello, i looked some pictures over google. But i cant dedice to problem. 3th week of plant. 250w mh light nearly 22hours open. Plagron lightmix soil with extra perlite. i cant find good quality ph meter. So im not sure from ph. Lastly i didnt give it to any nutrients till yesterday.first time i...

Is it ready to harvest? Thanks

i cant decide. what is problem? Im using advanced nutrients 1ml A + 1ml B bloom + 1mL carboload for every one liter water. 250hps light.

What could be problem(s) ?

hello what looks problem? 250w MH, biozbizz lightmix soil, and i give biobizz grow sometimes and biobizz acti vera with foiler spray. the problem looks only at top leaves. it looks generally healthly but i saw problem on the picture last 2-3 days and the problem is going on.