The Blue Damselfish, also known as the Blue Devil Damselfish, is an extremely popular marine fish because it is readily available and because it is very hardy. Although we don't recommend it, many hobbyists use this fish to cycle new saltwater tanks. There are better, more humane ways to cycle a tank such as using live rock to cycle your saltwater aquarium.They get the nick name Blue Devil because of their personality. They can be very belligerent with other fish in the tank, especially new arrivals. They are very bold and can hold their own with larger fish and may even go after your hand if it approaches their territory. They didn't get the memo about them only being a few inches in size. We'll call it the mighty mouse syndrome.
As mentioned previously, Blue Damsel fish will develop their own territory in the tank. Having live rock in your aquarium will help make them comfortable and it will provide them with hiding places. You can get away with keeping multiple Blue Damselfish in the same tank if you introduce them at the same time. Because of their "anger management" issues it is a good idea to introduce them last into your setup.
Blue Damselfish are not very picky when it comes to fish food and should accept most foods that you give them. Try to give them a varied diet of live, frozen, freeze-dried and vitamin-enriched flake foods.
They seem to be very resistant to most saltwater fish disease but you still need to take the proper pre-cautions and use a quarantine tank before introducing them into your main tank. After they've been in quarantine for two weeks or so and you notice no signs of illness you can acclimate them into your display tank.
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