What is a flashing tilefish?
“Flashing tilefish” is a trade name rather than a single clear species. Aquarium tilefish are small, colorful marine fish, typically in the genus Hoplolatilus and related groups, that live over rubble and sand slopes and shelter in burrows. Common names vary between retailers, and different sellers may apply the same name to different species. Before you buy, ask the seller for the scientific name and the adult size, and check care information for that specific species.
Tilefish are generally considered a moderate-difficulty group. They are peaceful and often attractive, but they are shy, they can ship poorly, and many have narrow feeding habits when first imported. They are best suited to keepers comfortable with patient acclimation and a mature tank.
Tank setup: sand, rock and a lid
The common thread among aquarium tilefish is their behavior: they hover close to the bottom, pick at the water above it, and dive into the rockwork or a burrow when scared.
- Sand bed. A fine sand bed several inches deep gives the fish somewhere to dig and shelter. A bare-bottom tank is generally not recommended.
- Rock and caves. Stable rockwork with open caves or arches provides escape routes. Secure the rock so it cannot collapse when the fish digs underneath.
- A tight lid. Tilefish are jumpers, especially when newly introduced or startled. A snug cover with few gaps is a sensible precaution.
- Space. Many sources suggest tanks of around 75 gallons or more for most Hoplolatilus-type species, since they appreciate length and open sand to swim over. Check the recommendation for your exact species.
- Stable parameters. Typical reef conditions are usual: temperature about 72 to 78 degrees Fahrenheit and specific gravity 1.023 to 1.025.
Feeding
Tilefish are generally carnivores that feed on small crustaceans and zooplankton in the water column. Imported fish are often reported to accept meaty foods like frozen mysis, enriched brine shrimp and small chopped seafood, but some are picky at first. Strategies that keepers mention include:
- Feeding small amounts two or three times a day
- Using live or live-culture foods such as copepods to start a hesitant fish
- Placing food near the fish rather than relying on flow
- Watching to make sure faster tank mates are not taking everything
A fish that refuses food for several days after arrival deserves attention, since weight loss is hard to reverse.
Are tilefish reef safe?
Most aquarium tilefish are generally regarded as reef-compatible because they do not eat corals. The cautions are different:
- They may eat very small crustaceans, such as tiny shrimp.
- Digging can shift sand and cover or uproot corals placed low on the rockwork or on the sand.
- Rockwork that is not stable can topple.
Place sensitive corals higher and keep rock away from the sand bed’s edge.
Tank mates and temperament
Tilefish are usually peaceful toward other species but can be territorial with their own kind. Keeping a pair or small group often requires a larger tank, careful selection, and a plan for removal if fighting begins. Do not assume that fish sold together are compatible.
Good companions tend to be calm and not too large or boisterous. Avoid aggressive fish such as bold dottybacks or large damsels that might push the tilefish into hiding. Adding the tilefish after quarantine and late in the stocking order is a common recommendation. For general ideas on peaceful fish with character, see our list of cool saltwater fish to own.
Acclimation: how long does it take fish to adjust?
There is no single fixed time. Many keepers use a drip or gradual method over roughly one to two hours to equalize temperature and salinity, followed by a period of observation. Even then, settling in may take days or weeks. A newly added tilefish may hide for much of the first few days.
Quarantine is also worth considering for any new marine fish, since it lets you treat disease without risking the display tank and gives a timid fish time to start eating.
Signs a tilefish is happy
Behavior is usually the best guide. Signs a tilefish is doing well include:
- Eating regularly and showing a rounded body rather than a hollow belly
- Swimming over the sand and into open water at times, then retreating calmly rather than frantically
- Clear eyes, intact fins, and bright coloration
- Digging or arranging a favorite burrow without constant hiding
Warning signs include persistent hiding, rapid breathing, scratching on surfaces (a possible sign of saltwater ich), faded color, or refusing food. If these continue, test your water and consult an experienced aquarium professional or veterinarian.
Not the same as fishing for tilefish
The search term “tilefish” also brings up sport and commercial fishing for large deep-water species such as golden tilefish. Those fish are unrelated to the small aquarium species discussed here, and advice about catching them does not apply to a home tank. If you are exploring other uncommon reef fish, our article on saltwater filefish is another option. Note that filefish are a separate group from tilefish.
Related reading
For a broader look at fish that are fun to keep, see our guide to cool saltwater fish to own.