Here are the pictures of the brown drying blotches.
I water them daily between 8am to 9am before I head off to work. I let the water run on them until i see the water flow out of the drain holes in the bottom. That usually takes 1 to 2 mins. I'm using pure Miracle Grow Palm/Cactus Mix. Its really fast at draining.
Today I did not water the SDC as I will see if it will do better if I only ater every other day.