Doubling your nutes seems like a pretty hard jump. I usually do my moves in 1/2 tsp (2.5ml) increments.
yeah Tead , my measuring spoon is a 2.5ml that's what I upped it. I feel much better about the red stems, im still getting nice green growth above it.
They do look good, don't they.... I love to see a nice healthy garden going. We tend to spend our time looking at plants or gardens with issues. A healthy garden is always a welcome change.
I've not seen the red caused by cal or mag issues myself.
I know that it's often attributed to a phosphorus def. The OGKs in my garden red up pretty quick when they need more food. I use it as an indicator with dark shiny leaves forming the other side of that indicator.
Of course, some strains or phono's of various strains often show red naturally.
Then there's the cold.... and winter is descending for those of us in the northern hemisphere.
I don't consider red a huge issue at all. Many folks like to stay on the light side of things and can experience some really pretty red growth.