Good advice above, you could also use some meaty, dead foods, like silversides or shelled shrimp to get him accustomed to eating nonmoving food, then switch over to pellets. A word of caution here, largemouth bass get big. Really big. In warmer climates they have been known to get over 3' long and 24 lbs. Thats alot of fish in a tank. They will also consume alot of food, so obesity can become an issue. In nature, they are opportunistic feeders, eating whenever a meal happens by. Then they may not eat for an hour, or 3 weeks. Good luck