Geophagus Sveni Red Head Care Guide: South American Earth Eater
Geophagus sveni, the red head Tapajos cousin from the Tocantins basin, is one of the most striking eartheaters available in Singapore but rarely the cheapest. A hobbyist-grade specimen at C328 or Iwarna runs $40 to $80, and the species needs more space and patience than the body length suggests. Solid geophagus sveni red head care centres on a long sandy footprint, soft acidic water and a peaceful South American community. This guide from Gensou Aquascaping at 5 Everton Park covers tank size, diet, breeding and the local sourcing notes that matter for a long-lived display.
Identifying True Sveni
True Geophagus sveni shows a vivid orange-red mask from the snout to the dorsal origin, with iridescent blue spangling on the flanks and a darker midline blotch. It is often confused with G. winemilleri and the orange head Tapajos morph; the sveni’s red extends further down the gill plate and the body shape is slightly more elongated. Singapore stock is usually F1 farm-bred from Asian breeders rather than wild, which is a fair compromise on cost and adaptability.
Tank Size and Footprint
Adults reach 18 to 20 cm and need a tank at minimum 150 cm long, ideally 180 cm, with a footprint of 60 cm front-to-back. They sift sand constantly and need lateral swimming room. A 4-foot tank holds a single specimen short term but cramps a group quickly. For HDB hobbyists, a 5-foot 450 litre tank on a reinforced floor remains the sensible commitment for a group of five to six juveniles.
Water Chemistry From PUB Tap
Sveni thrive at pH 5.8 to 7.0, kH 1 to 4 dKH, gH under 6, and 26 to 28°C. Singapore PUB tap, sitting around pH 7.5 and kH 2 to 3, is workable after passing through driftwood-rich tannin-stained water. RO blending at 50% with tap drops the pH to comfortable cichlid range. Nitrate should stay under 20 ppm; eartheaters are surprisingly nitrate-sensitive compared to African cichlids. Our peat moss aquarium softening water naturally guide covers natural acidification.
Substrate Choice Matters Most
Use fine, rounded sand at least 5 cm deep. Sharp sand erodes the gill rakers that sveni use to filter substrate, and gravel injures the mouth lining within a week. Local options include river sand from C328 at $15 per 5 kg or Carib-Sea Tahitian Moon at $40 per 9 kg. Avoid black aquasoil; the small grain catches in the throat. Our best aquarium sand comparison guide covers what works for sand-sifting cichlids.
Hardscape and Planting
Large smooth river stones, broad driftwood roots and Amazon biotope botanicals create the visual depth sveni need to feel secure. Plants should be either tough epiphytes attached to wood (Anubias, Bolbitis, Microsorum) or tall background species like Vallisneria gigantea. Sveni will uproot rooted stems and snip soft leaves; plan accordingly. The aquascape for discus tank approach scales well for sveni displays.
Diet and Feeding Schedule
In nature they sift substrate for chironomids, microcrustaceans and detritus. In the tank, feed a varied diet of sinking pellets like Hikari Cichlid Sinking Excel, supplemented twice weekly with frozen bloodworm, brine shrimp and chopped earthworm. Avoid floating pellets; they cause swim bladder issues in eartheaters. Two small meals daily produce better growth and colour than one heavy feed. Our cichlid pellet size chart guide covers pellet sizing for juveniles versus adults.
Tank Mates That Work
Pair sveni with peaceful South American dither fish that share their water preferences: rummy nose tetra schools of 20 plus, large hatchetfish, Geryi or Heckel discus, and L-number plecos for the algae work. Avoid aggressive cichlids, fast snatchers like Buenos Aires tetras, or any African species. Corydoras work in larger tanks where they can dodge the sand sifting. The aquascape for corydoras sand bottom piece outlines a sand-bottom community plan that suits sveni.
Breeding Behaviour
Sveni are biparental delayed mouthbrooders. The female lays 100 to 200 eggs on a flat stone, the pair guards them as wrigglers for 4 to 5 days, then both parents take fry into their mouths to brood for another 7 to 14 days. Drop water hardness and increase temperature by 1°C to trigger spawning. Pairs form within a group of six juveniles raised together; forced pairings rarely work in this genus.
Singapore Sourcing and Pricing
C328, Iwarna and Y618 cycle sveni stock irregularly. Juveniles at 5 to 7 cm are most often $40 to $60 each, with adult pairs commanding $200 plus. Aquatic Avenue and Polyart occasionally import wild Tocantins specimens at much higher prices. Quarantine all new arrivals for three weeks; eartheaters are prone to gill flukes and the prophylactic praziquantel dose is worth the effort.
Common Health Issues
Hexamita and head-and-lateral-line erosion appear in sveni kept in nitrate-heavy or low-oxygen tanks. Symptoms include white stringy faeces, pitting around the head and loss of appetite. Metronidazole at 250 mg per 40 litres for three days, repeated weekly for a month, addresses internal flagellates. Prevention is a 50% weekly water change and stable nitrate under 20 ppm.
Long-Term Display Notes
A mature sveni group hits its visual peak at four years old, with males developing extended dorsal and anal trailers and females holding deeper body colour year round. Plan for a 12 to 15 year lifespan in chilled, well-maintained conditions. The chiller is not optional in HDB Singapore; the chiller sizing singapore climate guide covers BTU calculations for tanks of this size.
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