Are 2 250w radiums over a 90 enough for a Crocea and foxface compatable?

I think your lighting is fine. The foxface is surely ok. As far as the angel goes, I THINK you will be fine. Keep him well fed and I doubt he will touch your clams.
 
I have the same bulbs and ballasts over my 100g (5' wide x 20" deep) and my clams are thriving...
 
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