Nute burn?
Roots are slightly brown (could be AN Piranha I'm using as it doesn't seem to every dissolve in the water) and they are soaking in a nicely aerated 4 gallon res. There was a ppm increase with the res change. I went from 700 to 900 ppm. One other note... I woke up this morning and the pH had dropped from 6 to 4.25. Normally speaking, my pH would increase ever so slightly every couple days.
This is my first grow.