I lied about them taking a few days to color up.
They've eaten four times now ( small portions ) in 30 minutes with ADA AP-1 Gold and have regained their original color, especially the black spots. Once they fatten up a bit and develop their color will be amazing hues.
I can't describe the dynamism they add to the tank, anyone without fish in their setup is missing out! Adds a whole new zen flair!
Currently 2 bps on co2. Will be monitoring plants and animals for tr appropriate co2 balance.