What type of cat? Sinking pellets buy lots as they eat like pigs. NLS sells a 5 pound sinking pellet for about 55.00 Amazon. Shrimp. Other fish. Krill. Just about any of the frozen stuff. When they get really large hot dogs. Costco size 1/4lb to grow faster feed more food. Mostly more often don't over feed in one sitting.
Sent from my DROIDX using MonsterAquariaNetwork App
How big are they? Give them sometime. Water changes help a lot to. Try some saltwater stuff like squid, calms, oysters but make sure they have no preserves. If you want the tails extra red feed shrimp/lobster the ones you get at the grocery store where they lay them out over the ice. Take off the shell if it's a bit to big for them if not its fine but I do just in case. Without the shell it's much easier for them to swallow. But you still get an extra awesome red tail either way!