This is a Hawaiian Snow plant that's about two months old and its doing fine with the exception of this deficiency that I just can't possibly identify. It's in a soilless mix, pH is about 7.2 Temp: 72-76, 40-50% humidity. I feed it the entire Roots Organics line, according to their schedule. 400w air-cooled MH, about 9 inches off the plant. Fresh air constantly being circulated with an 18" oscillating fan. Intake air is sucked in through a 180cfm can fan right from outside (constant fresh air). I thought it was a magnesium deficiency, but I've been foliar feeding her for about two weeks now with a solution of epsom salt and fresh water but that doesn't help.