Blacktail Humbug Damsel
A small damsel boldly banded in black and white with a black tail. Extremely hardy, inexpensive, and considerably more aggressive than its size suggests.
Feeding
Omnivorous and unfussy. Marine flake, pellets and frozen mysis and brine shrimp.
Compatibility
Reef safe but genuinely aggressive for its size, and increasingly so with age. Will harass fish considerably larger than itself. Best added last or kept in a species group.
Behaviour and personality
Holds a tight territory around branching coral or rockwork and defends it vigorously.
Before you buy
Very hardy, which is why it is often sold as a starter fish, but a mature humbug will bully almost anything added afterwards. Stock accordingly.
| Specification | Value |
|---|---|
| Species | Blacktail Humbug Damsel |
| Brand | Real Aquatics |
| Feeding Type | Omnivorous |
| Aggression Level | High (increases with age) |
| Reef Safety | Reef safe |
| Size | Small |
FAQ
Is the Blacktail Humbug Damsel safe for a reef tank?
Yes, it is reef safe, though it is aggressive and may harass other fish, especially larger ones.
What do Blacktail Humbug Damsels eat?
They are omnivorous and will eat marine flake, pellets, frozen mysis, and brine shrimp.
How should I introduce a Blacktail Humbug Damsel to my tank?
Add it last to the tank or keep it in a species group to minimize aggression toward other fish.

Harry Wallace –
Easy to care for and very hardy. It quickly starts defending its territory around coral. Not ideal for tanks with larger fish, but great as a starter species for beginners.
Julian Mackay –
It’s active and colorful, and stays healthy even in a small tank. Just be aware it gets more aggressive as it matures and may stress out other fish.
Blake Sutherland –
Works well in a group with similar-sized fish. I added it last and it hasn’t caused major issues. Feeding is simple with flakes and frozen food.
James Miller –
A solid choice for a beginner. It’s affordable, stays healthy, and adds visual interest. Just make sure not to mix it with larger or more timid species.