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Fish Freshwater Care: hard Semi-aggressive

Hypsolebias Magnificus

Hypsolebias magnificus
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Other names: Simpsonichthys magnificus, Magnificus, Annual killi
Group: Killifish and ricefish · Family: Rivulidae · Origin: South America — Brazil, the middle section of the Sao Francisco River basin

A 4 cm annual killi from temporary pools in Brazil's Sao Francisco basin; males are striped with dark and pale blue bands. It is a species for specialists; it is threatened in the wild and should be obtained only from captive-bred lines.

Will it suit my tank?

Last updated October 16, 2026

Temperature
22–27°C
pH
6–7
Hardness
2–8 dGH
Adult size
4 cm
Minimum tank size
25 liters
Lifespan
0–1 years
Social structure
Harem (one male, several females)
Group
at least 3
Male–female ratio
1 erkek : 2 dişi
Swimming zone
Middle
Diet
Carnivore
Breeding
Substrate spawner

Water parameters

Temperature22–27°C
pH6–7
General hardness (GH)2–8 dGH
Recommended range
May escape, needs a lid Suitable for planted tanks

Overview

October 16, 2026 · Suggest an edit

Hypsolebias magnificus, formerly listed in the genus Simpsonichthys, is an annual (seasonal) killifish native to the interior of Brazil. The male's body and broad fins carry a striking pattern of alternating dark and bright pale blue bands. It is known from only a few temporary pools, and its habitat is threatened by agriculture and water management projects. It is difficult to keep and breed: the eggs are usually stored in damp peat for 3–6 months, the hatching rate is low and the fry are delicate. It is suitable only for experienced keepers of annuals.

Tank Setup

October 16, 2026 · Suggest an edit
  • A 25-liter species tank for one male and two females.
  • A layer of peat on the bottom or a container filled with peat; dim light and a few plants.
  • 23–26°C, very soft and slightly acidic water; an air-driven sponge filter.
  • A tight lid is essential; 25% water change weekly.

Diet

October 16, 2026 · Suggest an edit

Carnivorous, with a small mouth. It should be fed live and frozen foods such as daphnia, cyclops, brine shrimp and small bloodworms.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

Males are rough with each other and persistent towards females. Because it is a small and delicate species, it should be kept only with its own species.

Good companions: females of its own species.

Avoid: community fish of any kind, other annual species, large and active fish.

A short profile for this species

The Hypsolebias Magnificus page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Usually compatible

Should not be kept together

Hobbyist notes

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Change history and contributors
  1. Page created · October 16, 2026