The plants look fine so far. :thumbsup:

The CalMag is usually recommended for those in flower using RO water, where the water has been filtered of nutrients, metals and other contaminates.

Molasses does the same thing as CalMag (and CalMag Plus) at a fraction of the cost. Also replaces Sweet, and other bulking agents that are sugar beet or molasses based. Molasses' listed nutrients: Calcium, Magnesium, Iron. (all of 'em in a form readily available to the plant)

Fox Farms Grow Big (for growth stage) and Tiger Bloom (flowering stage) are your nutes. They contain the micro's and metals necessary in that stage. Big Bloom is a compost tea designed to compliment both.

Relax, and continue following the Fox Farms Feeding Schedule, keeping an eye on the need for additional Grow Big after 2 weeks in flower.

I use the Fox Farms trio, but in flower I have cut the Big Bloom dosages in half, and replaced with 1 tsp unsulphured molasses per gallon of water. Been doing this for over 6 months, and am satisfied with the results.

38 days, but how large is the plant? How many internodes do they have? (the space between the stem's nodes are internodes)

Keep an eye on ingoing water ph. Any clue what yours is?