One of the Banggai cardinals I bought two weeks ago has hardly eaten anything, and not that I've seen in well over a week (a few half-hearted nibbles in the first 48 hours). He (gender indeterminant, but I'll call it a 'he') hangs out around the tank with the other, seems ok otherwise, but certainly doesn't dash around at feeding time like the other (who's turned into a pig). Won't touch frozen mysis, frozen krill, or the new life spectrum food pellets. I've soaked it in garlic guard, overfeed the tank like crazy (algae loves it.....). Any suggestions?