:rasta:Good Day
I am looking after 46 plants for a client and I just went through what you are going through now. And yes it looks like the start of a Cal/Mag problem. The curling of the leaves would confirm this. Do you have brown spots that look like rust are on leaves that are on side or bottom of plant with very little chance of light burn!!???? And small holes starting on leaves???

What I did to correct the problem was flush the plant with water. I used 5 gal bucket of water PH 6.3 and poured it into plant pot. The size of the Pot is 1 gal and let it drain out. The next day I mixed ¼ % Fish Emolusion and lightly fed plants. Next water was normal water with Fish Emolusion. Looked after the problem real well in 2 weeks back to normal.

I over fertizized my plants and they all had this problem. I also used Epsom salts at 1 Tablespoon per 1 gal of water and foler sprayed all leaves until gal of water was all gone. I managed to spray 3 times.

Good Luck
Surrey Compassion Club
:hippy: