look into dosing some potassium to bring out some colours. I dont see any algae in your tank so as you said your parameters must be in check. Usually with an ULNS you need to feed a TON - especially since you are running pellets.
when you do a water change is the "dirty" water yellow or crystal clear?
Are you running carbon?
try fragging both of those corals and place one clone up higher (closer to the light) and one lower to see how they respond to different amounts of light.
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