Introduction of Betta fish potentially altered behaviour of Harlequins?

Ian Davis

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I fairly recently introduced a Siamese Fighting Fish/Betta into my tank. In the first few days in was slightly aggressive but since then it has been relatively placid and doesn’t interact with other fish.
However, I have noticed that the 7 Harlequin fish in the tank have become more aggressive and territorial - albeit mostly amongst themselves.
Could this be in a response to the introduction of the Betta, or more likely just a coincidence?
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Yes, definitely. The Betta is stressing them out or vise versa.

I would recommend you get a separate 5g-10g tank for your Betta.
 

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