Care
The Slender Blockhead Cichlid is a rheophilic species known from fast-flowing segments of Pool Malebo and the Lower Congo River Basin. Here the water is turbulent and highly oxygenated. This habitat should be replicated as closely as possible in the home aquarium by using extra powerheads (in addition to the return flow from filters) to create a river type effect. The surface of the water should be visibly moving to ensure that there is a very high amount of oxygenation within the water at all times. An additional air-pump is also a handy back-up. Without such a high level of oxygenation and water movement, Slender Blockhead Cichlids will not fare well at all. These fish should really only be added to aquariums that are fully mature. Such tanks will have a good established growth of algae on the decor for the fish to graze upon in order to consume the micro-organisms within. Lighting should be fairly bright in order to encourage a decent amount of algal growth. Ideally, the aquarium will be at least 36" long, and contain a multitude of hiding spots amongst rocks, cobbles and bogwood. As these cichlids like to dig, provide a sand substrate and ensure all decor is secure and rocks are placed on the aquarium base (rather than on top of the substrate) so that they cannot be undermined. Flat smooth rocks should be placed in the path of the flow, where these fish will often congregate just as they would do in their natural boulder-strewn habitats. Be sure to incorporate a number of quieter resting areas out of the path of direct flow too. Plants can be included in the river style aquarium, but not all species will fare well under fast current. Having said this, many aquarists have had a good deal of success with Anubias species and Java fern (Microsorum sp.) tied and trained to grow on the decor. Plants are not found in great abundance in the natural habitat of Slender Blockhead Cichlids, so are not considered essential, but they will help with water quality and will make the aquarium look more aesthetically pleasing. Slender Blockhead Cichlids are territorial and best maintained as a male-female pair - they should not be kept with any other cichlid species. Tankmates could include some of the African tetra species or Synodontis catfish. These characterful cichlids are unusual in that they spend a lot of time hopping about on the bottom of the aquarium, in much the same manner as gobies. This is because they have a modified swim bladder that reduces buoyancy in the midst of vigorous currents.
Feeding
Flake, green flake, micropellets, and small frozen foods such as daphnia, white mosquito larvae, bloodworm and vitamin/spirulina-enriched brineshrimp.
Breeding
Slender Blockhead Cichlids are monogamous cave spawners. The water should be neutral to slightly soft and acidic with the temperature set towards the higher end of the preferred range. The best way to obtain a compatible pair is to purchase a group of young fish and allow them to pair off naturally. Once a pair has formed, the remaining fish should be moved to another tank. The breeding pair can then be conditioned on plenty of frozen foods. If ready to spawn, they will choose a suitable cave, either one that already exists amongst the decor, or they will excavate one themselves. Spawning is a rather secretive affair and will take place inside the cave. Up to 100 eggs will be deposited on the cave walls/ceiling, and these should hatch in 4-7 days (temperature dependent). It takes a further 5-7 days for the young to become free swimming, and they will be herded around the aquarium by the parents whilst they search for food. The parent fish are fiercely protective, and if there are other fish in the tank, they will attack them if they venture too close to the fry. The parents will guard their fry for up to 3 months, or until they have their next brood. Even when the parents are protecting a new brood, any previous young that are still in the aquarium are usually tolerated. Slender Blockhead Cichlids pair for life, and if one of the pair dies, it is very rare for the remaining fish to partner up again.
