Brackish or ‘fresh water’ Damselfish

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According to the old Innes Book, Exotic Aquarium Fishes, the Blue Devil is highly adaptable to lower salinities:
 
Here’s a comment where they received them in 1/2 strength seawater and acclimated them to FWBE92373D-997F-40A8-8F63-5FED7953C713.jpeg
 
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