Blue Damselfish Information
They're nicknamed Blue Devil due to their character. They can be extremely aggressive when they encounter any other tank mates, especially those who are new to the tank. They're very aggressive and compete with larger fish. They may even attack your hand when it gets close to their zone of residence. They don't seem to have a clue about themselves only being just a few inches. It's called the great mouse syndrome!
As we mentioned earlier, Blue Damselfish will establish their own territories within the tank. The presence of live rocks in your aquarium will make them more at ease and give them a place to hide. It is possible to continue keeping several Blue Damselfish in one tank if you introduce them at the same time. Due to the "anger management" issues, it's best to introduce them first to your setup.
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