Don't hire a Betta-babysitter. You can feed your betta for up to 7 days with Pro Balance Betta Blocks. Each fun-shaped block releases tubifex worms, bloodworms, daphnia, and white shrimp-a regular smorgasbord for your betta fish. Will feed 1-3 fish.
Clearly Kate did not read the description where it states that this is a sustained release product. The betta cannot eat itself to death because the food is released from the block gradually.
Don't do it! 7/23/2012
Bettas have been known to eat themselves to death. they can only eat about the amount as the size of their eye, and will keep eating until they are so bloated that they will seriously endanger their lives. Additionally, all the unconsumed waste will cause the parameters of your water, (nitrites, ammonia etc) to spike, which can cause death to your fish. You are actually better off NOT feeding them for a week!