Satanoperca acuticeps

Adult fish reach a length of 14 to 17 cm. Males are somewhat larger and have elongated outer rays on their dorsal and anal fins. Their coloration is silvery-beige, with rows of horizontal stripes formed by bluish speckles. Under certain lighting angles, the coloration can acquire a golden hue. The fins have a reddish tint. Three black spots are visible on the body.

The natural habitat of Satanoperca acuticeps is located in the central Amazon River basin, in Brazil, extending from the Rio Negro to the Tapajós. These fish prefer to live in small tributaries and floodplains of rivers, where the water can be both clear and turbid. The bottom in such places usually consists of silt and sand, covered with a layer of fallen leaves, among which numerous snags are found.

Satanoperca acuticeps are peaceful and calm fish. The only exception is during spawning periods, when they may show intolerance towards other species, striving to protect their offspring. At other times, they get along perfectly with most non-aggressive fish of comparable size. Within their own species, relationships are built on hierarchy, with alpha males holding the dominant position. To maintain stability in the group, it is recommended to keep at least 5–8 individuals. With fewer numbers, weaker fish may become targets of aggression from larger and stronger relatives.

For comfortable keeping of a group of 5–8 Satanoperca acuticeps, an aquarium of at least 600 liters is required. These cichlids are not demanding regarding design and feel great in various aquarium conditions. However, to fully reveal their beauty, it is recommended to create an environment that mimics their natural habitat. For this, fine-grained sand substrate can be used, and several snags resembling tree roots and branches can be placed. Lighting should be subdued. The presence of live plants is not a strict requirement, but if desired, shade-loving species such as mosses and ferns can be planted. Experienced aquarists often add fallen leaves from certain trees to the water to enhance the natural look. These leaves, as they decompose, release tannins that give the water a characteristic brown tint. More detailed information on this topic can be found in the article “What tree leaves can be used in an aquarium.” The key to successful and long-term keeping is maintaining stable water conditions within the optimal range of temperatures and hydrochemical parameters. It is important to prevent the accumulation of nitrogen cycle products, such as ammonia, nitrites, and nitrates, to concentrations dangerous for fish. To ensure the desired stability, it is recommended to install a powerful filtration system and regularly maintain the aquarium. Maintenance includes weekly water changes of approximately 50% of the volume with fresh water, timely removal of organic waste (uneaten food, excrement), equipment prophylaxis, and constant monitoring of basic water parameters, particularly pH and dGH.

This omnivorous species is capable of finding food both in the water column and on the bottom. They sift small portions of substrate through their mouths, searching for small invertebrates. In aquarium conditions, Satanoperca acuticeps readily accept most popular foods of appropriate size. Their diet can include dry flakes, pellets, as well as live or frozen brine shrimp, daphnia, and bloodworm pieces. It is advisable to feed them 3–4 times a day.

Breeding this species in a home aquarium is possible, although there is relatively little information about documented successful cases. This is likely due to their insufficient prevalence among aquarists. The breeding process of Satanoperca acuticeps is largely similar to other members of the genus. During the breeding period, the alpha male forms a temporary pair with one of the females. Together, they dig a small pit, where the female lays several dozen eggs, which are then covered with a thin layer of sand. The female remains to guard the clutch, while the male stays at a distance, chasing away any fish perceived as a potential threat. Fry appear after 2–3 days. The female continues to care for the young, while the male begins courting a new female.

The main cause of diseases often lies in the keeping conditions: if they go beyond acceptable limits, immunity decreases, making the fish vulnerable to various infections inevitably present in the environment. At the first suspicion of illness, it is important first of all to check the water parameters and ensure there are no dangerous concentrations of nitrogen cycle products. Often, restoring normal, suitable conditions promotes recovery. However, in some cases, medication may be required. Detailed information on symptoms and treatment methods is presented in the "Aquarium Fish Diseases" section.

When selecting individuals, attention should be paid to their activity and the cleanliness of their skin. Healthy fish should show interest in their surroundings, have no visible injuries, ulcers, white film, or signs of emaciation. Avoid purchasing fish that appear sluggish, constantly hide in corners, or have sunken bellies. Since this species is schooling and sensitive to hierarchical interactions, it is recommended to acquire a group of 5–8 individuals simultaneously to minimize stress and the risk of aggression from dominant individuals. Before purchasing, ensure that the aquarium in the store is equipped with a quality filtration system, as the species is extremely susceptible to water quality and the accumulation of nitrogenous compounds.