Thanks for the link.
So it actually looks like a copper deficiency.
The soil mix is an organic mix:
.10 -.05-.05
Nitrogen-Phosphate-Potassium
Thinking about trying to flush with tap water but I don't really know.
If using tap water just let it sit over night so the chlorine will evaporate out of it. I do this and the ph of my water will go from 12 down to 6.2 from sitting out for 24 hours. The leaf twisting could be a trait of the strain you're running, it doesn't look that bad to me.