After you check the soil ph, I would recommend checking the temperatures. My leaves looked just like that, I too thought it was a Mg deficiency, but it ended up being high heat/intense light from a 400w HPS literally 8-9'' away.

Also, I don't know about lockout; he said that he was going to order calmag, he is only using h2o & molasses as of now....correct acidboy? And Khronik, possibly changing of the light?