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I have a butterfly betta in my 75 gallon with Cory cats, a gourami, green fire, neon, black phantom, and penguin tetras, and some platies and they all get along fine.
I too have the Fluval 406 and it works great, quite, and easy to clean. I have my spout near the top for aeration but had to turn the bubbles on to keep the biofilm from forming.