Blackcap Basslet

Geographical Origin and Habitat: Endemic to the tropical Western Atlantic, common in the Caribbean, Bahamas, and Central American coasts. Inhabits deep reef drop-offs, preferring steep vertical cliffs, caves, and overhangs at depths of 10 to 180 meters.

Taxonomy and Morphology: Member of the Grammatidae family. Reaches a maximum size of 10 cm (4 inches). Features a moderately elongated body with a large mouth.

Social Behavior: Peaceful but territorial. Frequently swims upside down along cave ceilings or vertically against rock walls. Defends its chosen cave against other basslets.

Coloration and Sexual Dimorphism: Striking coloration: deep, electric magenta-purple body, with a prominent black cap running diagonally from the snout to the front of the dorsal fin. No visible sexual dimorphism.

Aquarium Setup: Needs at least 120 liters with plenty of live rock arranged to create vertical overhangs, crevices, and shady caves. Lower lighting levels are preferred. A tight lid is necessary to prevent jumps.

Diet and Feeding: Carnivorous. Feeds on zooplankton. Provide frozen mysis, brine shrimp, cyclops, chopped shrimp, and high-quality small pellets. Feed 1-2 times daily.

Water Quality: Prefers stable reef conditions: temperature 24-26°C (75-79°F), pH 8.1-8.4, specific gravity 1.022-1.025, GH 15-25, and KH 8-12.

Compatibility and Cohabitation: 100% reef-safe. Excellent reef community fish. Keep only one per tank unless the aquarium is very large (500L+). Do not keep with aggressive dottybacks.

Aquarium Breeding: Rare. The male constructs a nest of algae and detritus in a rock crevice to receive the female's eggs, guarding them until they hatch.

Risks and Diseases: High jumping risk. May become extremely shy and stay hidden if the tank lighting is too bright or if housed with aggressive competitors.