Damsel fish eat both plants and meaty foods. A good diet is a marine flake or pellet as the base, plus frozen mysis or brine shrimp and a little algae. They are among the hardiest saltwater fish, but they are also feisty, so the tank setup and tank mates matter as much as the food.
What Damsel Fish Eat in the Wild
In the ocean, damsel fish graze on algae and pick small crustaceans and plankton from the water. Many species defend small patches of reef where algae grows, which is part of why they behave so territorially in aquariums.
A Simple Feeding Plan for Aquariums
- Morning: a small pinch of quality marine flakes or soaked pellets.
- Evening: frozen mysis or brine shrimp, thawed and rinsed.
- A few times a week: nori or a spirulina-based food for plant matter.
Keep portions small, because damsels eat eagerly and can foul the water quickly.
Tank Size and Setup
Damsels are often sold small, but many species grow to a few inches and get more aggressive with age. A single small species can live in a modest tank, while a group needs far more space, with plenty of rockwork so each fish can claim a hiding spot. Overcrowding leads to fighting and stress, even with good feeding.
Tank Mates
- Choose similar-size, robust fish that can hold their own.
- Avoid very shy or slow feeders, which will lose food to a bully.
- Add damsels last, after more peaceful species have settled in.
- Do not keep several of the same damsel species in a small tank.
Troubleshooting
- Not eating: test water for ammonia and nitrite, check temperature and look for signs of disease.
- Bullying at feeding time: feed in two spots at once.
- Fish too thin: add a second feeding of a protein-rich frozen food.
Related Guides
For a full feeding guide, see our post on damselfish food. For other fish, read about shubunkin goldfish food.
Bottom Line
Damsel fish are easy to feed and tough, but they are aggressive. Feed them a varied diet in small amounts, give them room and choose tank mates carefully.
