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I would say it's from lack of light
I have him in a 90 gallon with a skunk cleaner and fire shrimp and will be adding my pistol shrimp once I get him a goby to pair up with.I would get a Hawkfish but worried about them eating shrimp and snails. Don’t want to lose any Pistol Shrimp which would also cause lots of stress to Yellow Watchmen Gobies. Love Hawkfish but so worried about getting one.
The one in the pictures for this postAhh what kind of Hawkfish is it?
Coloration of reef fish has a lot to do with environmental factors. If there are no colorful corals or at least rocks with lots of coralline fish may fade in their colors to blend in.
And you also have the bachelor-effect (getting sloppy with looks) with single fish if there are no mates to impress. Hawkfish are some of the easier fish to pair as they change sex both ways. Males have more black than females and often also a more vibrant red.