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I am not doing this, nor do I plan to (due to the aggressive nature of male bettas). But I was wondering if it would be possible to house multiple male bettas in a 200+ gallon tank? I definitely imagine it would be a lot of work, and a lot of plants with hide spots. But is it doable?

Opinions?

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    WHEN they find each other they will fight. – blacksmith37 Feb 20 '19 at 22:09
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Since you say 200+ without upper limit, I will say Yes if the tank is big enough (I cannot provide a number unfortunately) to allow for a different, defendable territory for each betta. And like you say a lot of places to hide or swim away. Every betta has a different personality. Some of them might insist on killing the other one unfortunately.

It also matters which fish is introduced first. If a fish already decided that the whole aquarium is his, the new one has more chance to be bullied. Likely a newly-arrived betta might be more timid with fishes that are already at-home. It might be better to introduce both at the same time, with the lights closed. Don't leave the lights open for too long, you will reduce aggressivity like this.

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200+ gallons seems to approach a commercial-sized aquarium and at this point I think it would better to get in contact with an aquarium consulting company and ask them. There may be a better way.

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