wanted to add, I believe Brent Brock said the cyclopeeze/ caratenoid idea works for pumilio, but not as well for the tricolors once they become adults, as there is a cut off point. I use UVB 7% power compact as well, with OP4.
Corey mentioned to me one day that a WC tricolor was still red after many years, so the coloration must develop more when the frog is in the tadpole stage or a young froglet.
I do add a caratenoid supplement as well to my mix, carrot and beet powder. I feed my tricolors larva that have been gutloaded on a mix with paprika and different juices. Not much has changed.
So, I'm going to set up an experiment on my next batch of tadpoles to see what happens.