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Why does betta fishs fins look like swiss cheese?

April 26, 2017betta cheese fins fish look Swiss

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Why does betta fishs fins look like swiss cheese?

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Some Bettas have been selectively bred to have holes and threads in their fins. If your Betta does not normally have these and they are suddenly happening to the fish then The fins are being destroyed by poisons in the water. You urgently need to change its water ASAP.