I went to PetSmart the other day and got some stuff for my betta tank. There's a crown tailed betta in there and he hasn't been taking care recently so I'm trying to change that. He lives in there with a a Winsteria, Japanese Moss Ball, and a cute cory fish which sticks to the sides. The tank is about 2.5 gallons and I feel as if i overcrowded the tank. The lady at PetSmart said a cory would be good for the tank but he doesn't eat(his algae pellet dont shrink) and I worry for his health. I really want him to be happy, should I move him to a jar and just let the cory live there? Help please!
Extra Info: the betta bullies the cory sometimes