MedGrower
That hydrodude again
@Gauge Steel @MedGrower pH is 5.9 and water temp 24.4 celcius.
I used to see similar spots on my garden too everytime I had solution below pH 6.0. You might have a calsium hog strain and LEDs that also contribute to that. Remo's MagNifiCal is excellent so you wont need more than that.

:smoking:
they are ultimates all.