I have just gotten a damsel a few days ago, and three new fish as of today. Only one of my fish, a fiji damselfish is eating. The rest which are two clownfish and one singapore angel don't seem to be. Why are they not eating? Is it because of the food I have, and they're wrong? Or since I just got them do I need to wait for a couple of days? The food that I've been trying to give are the Prime Reef Flakes.