Need Expert Advice

Aliendog (Ether Pheno)
Veg time: About 1 1/2 months
Medium: Roots Organics Soil
Lighting: 2ft 4bulb T5HO
Temps / Hum: 65-80F 30-50% RH
Container: 6 Inch Square Pot
Nutrients: General Organics BioMarine / CalMg+

Looks to me just like a Magnesium Def. Last watering PH'd Nutes going in at 6.4 Runoff at 6.6-6.7 This Problem is happening from the Top-Middle of the plant. I can't figure out the cause. I've tried PH Flush / Foliar feeding CalMg+ / Upping the nutes. I have experienced slight tip burn from upping the nutes.

Any Ideas?

Your BioMarine fertilizer doesn't have enough Potassium.

Up until last feeding I was using Botanicare PBP Grow for Soil.

I use http://theallorganicgarden.myshopify.com/ and http://www.gardeners.com/Garden-Lime/FlowerGardening_FertilizersSoil,35-738,default,cp.html

I'd guess that she is rootbound in her 6" pot. @ 6 weeks old in that pot she is probably getting oxygen starved, which can start looking like a range of problems.

^Agreed, a transplant will make your(and the plants.lol) life 10x easier. Aside from the root restriction, it sounds like your PH is a little high, too(in the soil), which could be making magnesium availibility, limited.