Join Date: Aug 2011
Location: Kingston, Ontario
It's because they're all anabantoids. Gourami, betta and paradisefish, in the wild they all compete for the exact same resources, insects, and bubble nesting areas (or safe places for mouth brooders). They're related and, I guess they just instinctively know who is their enemy.
I'm surprised your betta and gourami are fine together.
He will reach 4" if you take good care of him, and yes they are freaking crazy animals. TFK states the minimum as 20 gallons.. Though I've heard of people keeping them in 1 gallon (same reason as betta). I guess 20 gallons is a lot of room for one fish though.
Btw good colors on this boy!
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