Ornate tetra

About this species

Megalamphodus bentosi is a small characin from the Amazon region. Its body is often silvery with a pink or reddish-brown wash. Males may develop more pronounced, strongly coloured dorsal and anal fins, while mature females are usually deeper-bodied. Older literature commonly calls the fish Hyphessobrycon bentosi. Current taxonomic sources use Megalamphodus bentosi (Durbin, 1908); related species such as M. rosaceus remain distinct taxa and are not merged as synonyms.

Seriously Fish reports about 45 mm standard length, measured without the caudal fin. The type locality is the lower Amazon near Óbidos in Pará, Brazil. Trade names include Bentos tetra and white-tipped tetra. Because related rosy tetras are more commonly offered and look similar, a shop label alone may not identify every fish with certainty.

Natural habitat

The species mainly inhabits sluggish tributaries, side arms and forest lakes, often near submerged roots, branches and marginal vegetation. The specialist profile describes natural water that may contain few dissolved minerals, be weakly buffered and stained brown by tannins. This describes ecological context; it is not a reason to create unstable water chemistry at home.

Use wood, plants and optionally aquarium-safe leaf litter to provide shelter. Floating plants can soften the light. Retain open swimming space for the shoal. Leaf litter is optional; remove material if it complicates water quality or maintenance. Ornate tetras can live in a planted community aquarium when it is mature, clean and appropriately stocked.

Aquarium and layout

Seriously Fish gives a minimum base footprint of about 90 × 30 cm and approximately 81 litres at a typical water depth. Treat this as the smallest source-based size, not a universal stocking formula. A longer aquarium gives the shoal more horizontal room. Keep at least eight to ten fish, ideally including both sexes. They show temporary social hierarchies, and males display more when companions are present.

The species needs a fully cycled, clean system. It tolerates organic waste poorly; the specialist source recommends routine weekly water changes. Combine these with suitable filtration, while avoiding a forceful jet across the entire tank. Provide plants and wood as shelter and ensure all fish can feed calmly. Do not introduce ornate tetras to a biologically immature aquarium; increase stocking gradually.

The stated 81 litres follows from the recommended base size and an example water depth. More volume alone does not replace length, maintenance or appropriate group size.

Water conditions

The specialist aquarium profile gives 20–28 °C, pH 5.0–7.5 and GH 1–12 dGH. These are broad care ranges; choose stable conditions appropriate to the fish’s source and previous water. Soft, mildly acidic water reflects many natural habitats, but there is no reason to acidify a stable aquarium abruptly.

The species is sensitive to accumulated organic pollution and should only be kept in a mature aquarium with consistent maintenance. The reviewed sources do not establish a species-specific KH target, so none is supplied. Test when appropriate and change conditions gradually. Natural tannin-stained, mineral-poor water is habitat context; brown colour or peat is not an independent health goal.

Behaviour and group size

The ornate tetra is peaceful and suits a carefully planned community. Keep at least eight to ten together; temporary dominance relationships and display behaviour develop within a group. Males tend to be slimmer and smaller and may show stronger colour and fins. Females are usually fuller-bodied. Visible differences vary with individual condition.

Choose companions of similar size and temperament, such as appropriate South American shoaling or bottom-dwelling fish. Avoid large predators and species that aggressively outcompete them for food. Rosy and ornate tetras are sometimes confused, so accurate identification matters when assessing tankmates. Shared pH or temperature alone does not prove a safe combination. Watch food intake, fin condition and whether every fish can reach cover.

Feeding

Megalamphodus bentosi is omnivorous. The specialist source lists small invertebrates, crustaceans, filamentous algae and fallen fruit among natural foods. In aquaria the fish may accept dry foods, but a varied menu that includes small frozen and live prey such as Daphnia, mosquito larvae and bloodworms is appropriate.

Fine granules and flakes make a practical staple when the fish eat them readily. The linked TetraMin Mini Granules is a small complete food; offer modest portions and check that less dominant fish also feed. Alternate it with suitable animal-based supplements. Remove leftovers and avoid overfeeding because this species needs clean water and excess food adds waste.

Breeding

The ornate tetra scatters eggs and provides no parental care. Fry may occasionally appear in a mature aquarium, but adults eat eggs they find. For controlled breeding, use a separate mature tank with very subdued light. Add a fine-leaved plant, spawning mop, marbles or a mesh that keeps eggs out of adult reach. An air-driven sponge filter provides gentle circulation.

The source recommends slightly acidic to neutral water and a temperature toward the upper end of the care range for breeding. Condition adults beforehand with varied foods. Eggs are often noticed the following morning; remove adults afterwards. Newly hatched fry need very fine foods such as infusoria or paramecium; only later can larger microorganisms or Artemia nauplii be offered. These are guidelines, not a guarantee of success. Maintain stable water and avoid rapid corrections.