It has been a while since I have had a fish tank. I am starting off small (2.5 gal) I established the tank with a Betta. Today I added a male and female guppy. The Betta is very aggressive toward them both. I have never heard of this, is it normal for the Betta to act this way? Will he calm down after a while or should I go ahead and put him in a bowl? Thanks for any help.