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This is not a good match long-term. Male guppy are brightly coloured, and this is documented as being like waving a red flag in front of a bull. Betta frequently attack such fish.

The guppy may decide to nip the flowing fins of Betta.

Betta are not community fish, and will always be better on their own in a suitable aquarium. But in an emergency, you might get by.

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