They both look pretty light colored to me. It’s not that it’s a bad thing at all. If you want to encourage darker colors you can switch to a neutral or darker colored substrate. Maybe even adding more cover might help to bring out more color.
Gold circle = Gold JD (note that there is no mottling in the coloration)
White circle = Platinum (notice that there is some mottling)
Blue circle = EBJD, similar to what yours look like.
Electric Blue in my opinion. Like others have said - change to dark substrate and background and I'm sure it'll colour up nicely. Like you're already doing, good quality food helps too.