I have something like 5 croceas on the sand along with 6 maximas, as well as some in the rocks. All seem to be doing well.
I also feed DTs and KoralVit F (thanks, Barry!!!).
If you're going to have maximas or croceas on the bottom of the tank, you need to have the light power to do it, and I think you should be ok with your 14K DEs...
James