Blue-Eyed Cichlid (Cryptoheros spilurus) — 5-6cm

Overview

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The blue-eyed cichlid, scientifically classified as Cryptoheros spilurus, represents one of the most visually striking and temperamentally engaging Central American cichlid species available to intermediate and advanced aquarists. This compact cichlid originates from freshwater systems across Central America, where it inhabits rivers, streams, and lakes with rocky substrates, moderate flow, and neutral to slightly alkaline water chemistry. The species is immediately recognisable by its vivid blue eyes, bold vertical barring, and iridescent body coloration that intensifies during breeding and territorial displays. With an adult size of approximately 12 cm, the blue-eyed cichlid is more manageable than many larger Central American species, yet retains the characteristic territorial behavior and pair-bonding dynamics that make cichlids fascinating to observe. The species exhibits semi-aggressive temperament and is best suited to carefully planned cichlid communities or species-specific setups with robust tankmates. Now available for sale UK-wide, Cryptoheros spilurus offers dedicated aquarists a rewarding opportunity to maintain a beautiful and behaviourally complex Central American cichlid.

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Appearance and Physical Characteristics

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Cryptoheros spilurus displays a robust, laterally compressed body typical of Central American cichlids, with striking coloration that varies based on mood, health, and breeding status. The base body colour ranges from grey-blue to olive-green, overlaid with bold dark vertical bars or blotches that become more intense during territorial displays and spawning. The most distinctive feature is the species' vivid electric-blue eyes, which provide the common name and create a captivating focal point. Mature males typically develop longer, more pointed dorsal and anal fins than females, and may display a slight nuchal hump (forehead bulge) when fully grown. Females are generally smaller and exhibit rounder bodies, particularly when carrying eggs. Adults reach approximately 12 cm in length, making this a moderately sized cichlid suitable for medium to large aquariums. The overall appearance is bold, colourful, and dynamic, with coloration intensifying dramatically during breeding and territorial encounters.

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Natural Habitat and Distribution

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In its native Central American range, Cryptoheros spilurus inhabits freshwater rivers, streams, and lake margins with rocky substrates, moderate water flow, and abundant hiding places formed by boulders, crevices, and submerged roots. Natural water chemistry tends toward neutral to slightly alkaline pH with moderate hardness, and temperatures remain warm and stable year-round between 24-28°C. The substrate consists of rocks, gravel, and sand, and the species establishes and defends territories centered on caves or rocky shelters. Natural diet includes algae, plant matter, invertebrates, insect larvae, and small fish, reflecting the species' omnivorous feeding strategy. The blue-eyed cichlid is adaptable and occupies diverse microhabitats within its range, from fast-flowing rocky sections to quieter, vegetated margins. Understanding these natural preferences is essential for providing appropriate captive conditions.

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Aquarium Setup and Tank Requirements

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A minimum aquarium volume of 75 litres is recommended for a pair of Cryptoheros spilurus, with significantly larger setups required if housing with tankmates or maintaining multiple pairs. The substrate should consist of sand or fine gravel, and the aquascape should feature rocks, driftwood, caves, and visual barriers arranged to create distinct territories and break lines of sight. Providing multiple caves and hiding places is essential, particularly during breeding when pairs become exceptionally territorial. Hardy, robust plants such as Java fern, Anubias, and Vallisneria can be included, though the species may dig and rearrange substrate during territory establishment. Filtration should be robust and capable of handling the waste production typical of cichlids. Weekly water changes of 25-30% are recommended to maintain water quality and prevent nitrate accumulation. Lighting can range from moderate to subdued, and the species tolerates a range of water chemistry conditions, though neutral to slightly alkaline pH is preferred.

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Feeding and Nutrition

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Cryptoheros spilurus is an omnivore requiring a varied diet to maintain optimal health and vibrant coloration. Offer a balanced diet consisting of high-quality cichlid pellets as the staple, supplemented with frozen or live foods such as bloodworms, brine shrimp, mysis shrimp, and daphnia. Vegetable matter should also be included regularly, with occasional offerings of blanched spinach, courgette, peas, and spirulina-based foods providing essential fibre and nutrients. Feed once or twice daily in portions that can be consumed within 2-3 minutes, adjusting based on activity level and body condition. Remove uneaten food promptly to prevent water quality degradation. The species is an enthusiastic feeder and will actively compete for food, so ensure all tankmates in community setups receive adequate nutrition. Dietary variety is essential for maintaining the species' striking blue eye coloration and overall vitality.

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Behaviour and Social Structure

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Cryptoheros spilurus exhibits semi-aggressive behavior characterised by strong territoriality, particularly during breeding periods when pairs become exceptionally defensive of chosen spawning sites and offspring. The species forms strong, long-lasting pair bonds, and bonded pairs cooperate to defend territory, guard eggs, and protect free-swimming fry. Aggression is directed primarily toward conspecifics and other cichlids perceived as territorial competitors, though tankmates of appropriate size and temperament can often coexist in sufficiently spacious setups. Outside of breeding, aggression is moderate but still present, and the species is unsuitable for peaceful community tanks housing small or timid fish. The species is diurnal and active throughout the day, displaying fascinating pair-bonding rituals, territorial displays, and parental care behaviors that make it a rewarding species for dedicated observation.

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Compatible Tank Mates

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Selecting suitable tankmates for Cryptoheros spilurus requires careful consideration of size, temperament, and water chemistry compatibility. Ideal companions include robust, similarly sized Central American cichlids in appropriately sized tanks, large, fast, sturdy fish that can tolerate cichlid aggression such as larger barbs or rainbowfish, and large armored catfish like Plecostomus or similar tough bottom dwellers. Avoid small fish that can be bullied or eaten, long-finned fish susceptible to nipping, very passive species unable to defend themselves, shrimp and small invertebrates which will be predated, and other territorial cichlids in undersized tanks where space limitations exacerbate aggression. The key to successful community housing is providing exceptional space, numerous hiding places and visual barriers, and ensuring all tankmates are robust enough to withstand occasional displays of aggression.

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Breeding in Captivity

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Cryptoheros spilurus breeds readily in captivity with minimal intervention, making it an excellent choice for aquarists interested in observing cichlid reproductive behavior. Pairs form naturally, and once bonded, they will select a cave, flat rock, or similar surface for spawning. The female deposits adhesive eggs, which both parents guard aggressively, fanning them to ensure oxygenation and removing dead or fungused eggs. Eggs typically hatch within 3-4 days, and the fry become free-swimming several days later under the watchful protection of both parents. Fry can be fed newly hatched brine shrimp, microworms, or finely crushed flake food. Both parents exhibit exceptional parental care, herding fry and defending them vigorously against perceived threats. Due to the species' territorial aggression during breeding, a separate spawning tank or removal of tankmates may be necessary to prevent injury. Be prepared for multiple spawns and have a plan for managing offspring.

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Why Buy from Tropical Fish Co

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At Tropical Fish Co, we specialise in providing healthy, carefully sourced specimens of beautiful and engaging species like Cryptoheros spilurus. Each blue-eyed cichlid we supply has undergone comprehensive quarantine and health assessment to ensure it arrives in excellent condition, displaying vibrant coloration and feeding enthusiastically. Our expert team provides detailed care advice tailored to Central American cichlids, helping you create the optimal environment for breeding and long-term success. We use professional-grade packing methods with insulated containers and appropriate heat packs to guarantee safe delivery across the UK, regardless of season. Whether you're establishing a Central American biotope, building a robust cichlid community, or seeking a stunning breeding project, our commitment to quality livestock, expert support, and ethical sourcing makes Tropical Fish Co your trusted partner in freshwater fishkeeping excellence.

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