This is my first grow. I'm using a 32' 32' 64' grow tent, with a 6 inch carbon filter and fan. I have the filter on the outside with the fan on the inside with ducting connecting them and running to cracked window. I have 4 plants, all autoflowers 2 Northern Delights,1 Afghan Kush, and 1 Green Crack dropped in 3 gallon smart pots. I'm using Coco Coir Perlite mix and Fox Farms Trio Nutrients ( 2 tsp of Grow Big, 3 tsp of Big Bloom, and 1 tsp of Cal Mag Plus per feeding). I tap water that has been sitting out for at least 24hrs and ph'd between 5.5 and 6.5 I'm using a 315 Cmh with 3100k light on a 20/4 schedule. Temperatures run between 68°(early morning with lights off) to 81° with tent closed. I normally keep it partially open with a fan blowing over my babies.They are about 4 weeks and have been doing great. Up until this morning. I was checking my babies and saw spots on the leaves and some holes. I researched and one looks like a calcium deficiency but I'm not certain and definitely need help. Please help, I've attached pictures