I recently added a coral beauty angelfish to my tank yetserday. The LFS store recommended I feed it frozen angel formula, which I bought. I put half a cube in warm water, and added it to the tank. No one ate it though (including my angelfish). Is this common for a new fish, or are there better ways to do this? I also have formula 2 pellets which the rest of my fish are used to eating. Should I switch back to that? Any suggestions?