IME, it really depends on the particular fish. I have a 4 year old pearl in one tank that only eats algae wafers. It hates flake food, blood worms, shrimp pellets. It refuses to eat any of these things. On the other hand, I have a younger pair that will eat anything I put in the tank. I would try maybe shrimp pellets or Hikari wafers. Its also normal for a fish to not eat much when it is getting use to its new enviroment.