Mag deficiency on young DJ shorts blueberry

Could someone let me know if you think this is a mag deficiency ? I'm vegging under 2 6500k 54 watt t5 bulbs and one 3000k. About 4/5 inches from the tops and using fox farm soil with adding only gen hydroponics flora grow. Please let me know and thank you.

Any idea if this sounds right? The light on the outer edge of the leaves?

I would agree, Mg. Just have to ask why just GH grow? GH flora is a 3 part nutrient or at the very least 2 part (micro&bloom). Any way your on the right track, just get her some more Mg good luck .