Black Cap Basslet

Black Cap Basslet (Gramma melacara) is a purple basslet with a distinct dark cap across the upper head. It shelters beneath deeper reef ledges and retreats into caves, feeding on small animal foods near cover.

Its natural range is Western Atlantic, Bahamas and Caribbean deeper reef slopes. Provide several dark recesses, stable overhangs, and clear escape routes around the preferred cave. Its aquarium appeal comes from observing the fish's natural use of shelter and feeding space rather than expecting every basslet to swim conspicuously in the open throughout the day.

New arrivals benefit from shade and gradual exposure to the display's lighting. A black head cap distinguishes it from Royal Gramma; its adult size and cave defense require their own space allowance. Plan adult housing of at least 40 gallons, with additional room where other fish share its territory. Adult requirements apply to juvenile listings as well, and purchase size should not determine the long-term stocking plan.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 40 gallons
Adult Size: Up to 4 inches total length
Temperament: Semi-Aggressive
Diet: Carnivore
Reef Safe: Yes
Region: Western Atlantic, Bahamas and Caribbean deeper reef slopes
Scientific Name: Gramma melacara

Tank Requirements

Provide an established aquarium of at least 40 gallons, allowing room for an adult up to 4 inches total length. Provide several dark recesses, stable overhangs, and clear escape routes around the preferred cave. Larger systems are preferable where multiple fish need separate territories; nominal volume alone does not establish compatibility.

Build the rockscape around stable refuges rather than a single attractive cave. Several entrances, overhangs, and routes through the structure let a fish retreat without being cornered and help neighboring animals stay outside each other's immediate home area. Support heavier rock independently of loose sand and avoid stacks that can shift during maintenance.

Keep some open space in front of the preferred shelter so the fish can turn, watch its surroundings, and intercept food. More rock is not automatically better if every feeding route is blocked or the fish disappears into an inaccessible pocket where its condition cannot be checked. Leave practical access for observation and removal of trapped food.

Use broad variable circulation, effective biological filtration, and good gas exchange, with a quieter feeding pocket away from a direct pump jet. Fit a secure lid and screen overflow entrances and pump intakes. Secretive fishes can still jump when startled or displaced, especially while settling into an unfamiliar aquarium.

Choose lighting and shelter together. A brightly lit reef can accommodate a shade-oriented basslet when deep overhangs remain available throughout the day; an exposed pile of rocks does not offer the same security. Acclimate arrivals gradually to the display and avoid repeatedly removing their refuge just to make them visible.

Provide refuges proportionate to the full adult body, not only narrow holes that suit a small new arrival. A favorite cave can become unusable as the fish grows. Keep a clear approach so the fish can feed without passing directly through another resident's defended home.

Diet and Feeding

Diet: Carnivore. Offer a variety of suitably sized marine animal foods and accepted complete carnivore preparations rather than relying on incidental grazing or leftovers.

Suitable foods may include:

• Appropriately sized mysis shrimp

• Copepods, cyclops, and other small marine plankton foods

• Enriched brine shrimp as part of a varied ration

• Finely chopped marine crustaceans or suitable shellfish

• Balanced frozen marine carnivore preparations

• Small complete marine carnivore pellets when accepted

The main ration should be suitable marine animal foods and complete carnivore preparations. A fish picking among rock or algae is often hunting the small animals living there; that behavior does not establish an herbivorous diet. Use particles that fit the mouth easily and confirm that food is swallowed rather than repeatedly mouthed and rejected.

Offer modest portions two or three times daily, adjusting quantity to body condition and actual intake. Several small opportunities are especially useful for nervous newcomers and fishes that collect fine plankton. An established aquarium's microfauna can supplement feeding but should not be assumed to provide an adequate complete ration.

Deliver a little food near the chosen shelter when faster tankmates intercept everything in open water. A pipette can release a gentle cloud without touching or chasing the fish. Feed the rest of the community at another point if necessary, and restore normal circulation after any brief feeding adjustment.

Rotate appropriate frozen foods with accepted complete pellets or preparations. Enriched brine shrimp can encourage feeding, but should not become the only food indefinitely. Inspect the abdomen and the body behind the head for gradual thinning, and adjust delivery, particle size, and competition before simply adding more food to the aquarium.

Remove accessible leftovers and keep waste export matched to the feeding routine. Food trapped deep in caves can degrade water quality without ever reaching the intended fish. A newly introduced basslet that hides through repeated meals needs careful assessment of intimidation, food acceptance, and condition rather than an assumption that it will eventually find enough leftovers.

Temperament and Tankmates

Overall temperament: Semi-Aggressive. New arrivals benefit from shade and gradual exposure to the display's lighting. A black head cap distinguishes it from Royal Gramma; its adult size and cave defense require their own space allowance.

Expect a preferred refuge and repeated short feeding excursions rather than constant open-water cruising. Some species may hover at unusual angles close to cover. A fish should gradually show a reliable feeding response; persistent withdrawal combined with thinning warrants investigation of both health and competition.

Provide one individual per modest aquarium unless a compatible pairing or group has adequate room and individual retreats. Even relatively peaceful basslets can defend a cave or sleeping area. Similar-looking fishes and other crevice dwellers may provoke more interest than unrelated midwater companions.

Choose nonpredatory community fishes that do not crowd every hiding place or strip all small food from the water. Avoid large predators and persistent fin nippers. Observe actual interactions after introduction, and separate animals if chasing, injury, or exclusion from shelter continues despite an appropriate layout.

Reef Compatibility

Reef Safe: Yes.

The reef classification is Yes. Healthy coral tissue is not a normal feeding target, and these small fishes can suit a thoughtfully stocked reef. Their need for shade does not require turning off appropriate lighting for the corals; provide genuine overhangs and let the fish choose its preferred exposure.

Minute crustaceans, larvae, and other small animal foods can still be consumed. Established ornamental shrimp, snails, and larger cleanup animals are generally compatible, while exceptionally tiny juveniles need individual assessment. Reef safe does not mean the fish leaves every microscopic organism untouched.

Keep delicate coral tissue clear of busy shelter entrances and secure small fragments. A defended cave can affect the movement of neighboring fishes without any coral being eaten. Observe interactions and feeding access after changes in stocking rather than relying only on a broad compatibility label.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Maintain stable marine conditions, good oxygenation, and an established biological filter. Keep ammonia and nitrite undetectable, manage nitrate and organic waste, and match filtration to the real feeding load. Consistency is more useful than repeatedly adjusting conditions to hit one exact number within a practical range.

Match replacement water carefully and avoid abrupt temperature or salinity changes during transfers and maintenance. Check appetite, respiration, body condition, and access to shelter alongside water tests. Normal readings alone do not rule out nutritional decline or intimidation by tankmates.

Quarantine new arrivals with the same essential cover and appropriately sized foods used for long-term care. Observe reliable eating before introduction and keep transfer equipment clean. A quiet holding environment makes it easier to assess a secretive fish than an exposed, crowded system.

Common Considerations

• Adult Planning: Allow for 4 inches total length and at least 40 gallons. The chosen tank must also provide usable adult shelter and feeding access.

• Correct Species: New arrivals benefit from shade and gradual exposure to the display's lighting. A black head cap distinguishes it from Royal Gramma; its adult size and cave defense require their own space allowance.

• Feeding Access: Offer small marine animal foods two or three times daily and verify swallowing. Check the fish's abdomen and the muscle behind its head, especially if faster companions clear most food.

• Shelter: Provide several dark recesses, stable overhangs, and clear escape routes around the preferred cave. Normal hiding should still permit checking appetite and body condition.

• Reef Compatibility: The reef classification is Yes. Healthy coral tissue is not a normal feeding target, and these small fishes can suit a thoughtfully stocked reef. Their need for shade does not require turning off appropriate lighting for the corals; provide genuine overhangs and let the fish choose its preferred exposure.

• Social Planning: Keep one in a modest display unless compatibility, individual refuges, and feeding access have been planned for multiple fish. Be prepared to separate incompatible animals.