The Red Phantom Tetra (Hyphessobrycon sweglesi) is a distinctive freshwater aquarium fish valued for its appearance and behaviour. It is native to slow tributaries and forest waters of the Orinoco basin in Colombia and Venezuela. Understanding its small natural habitat details helps aquarists provide the right flow, cover, food and tank mates.

Red Phantom Tetra Size and Aquarium Setup

Adults reach about 4 cm (1.6 inches). A 75-litre (20-gallon) tank is a sensible minimum for a group of eight to twelve. Plants, wood and open swimming room create a secure but active setup. The aquarium should be fully cycled before the fish are added, and routine partial water changes should be used to keep nitrate and dissolved waste under control.

  1. Use a mature, fully cycled aquarium.
  2. Provide cover as well as open swimming or feeding space.
  3. Match filtration strength to the species’ natural habitat.
  4. Prevent sudden changes in temperature or water chemistry.

Water Conditions

Recommended conditions are 20–26°C (68–79°F), pH 5.5–7.5, and soft to moderately hard water. They often show their best colour in slightly acidic water with gentle lighting. Always acclimate new fish gradually and test ammonia, nitrite and nitrate, especially during the first weeks after introduction.

Diet and Feeding

The Red Phantom Tetra should be fed omnivorous; offer flakes, small pellets, daphnia, brine shrimp, bloodworms and mosquito larvae in suitable portions. Offer portions that can be eaten promptly, vary the diet through the week and remove uneaten food before it affects water quality.

Sexing Red Phantom Tetra

Males are often slimmer and more vividly red, with taller dorsal fins. Females are fuller-bodied, especially when carrying eggs. Juveniles can be difficult to sex, so differences may only become clear as the fish mature.

Breeding

Pairs scatter eggs among fine plants. Use a separate breeding tank with subdued light and soft water, then remove the adults. Eggs and fry are sensitive to bright light and poor water quality. Consistent feeding and very clean water are usually more important than frequent handling or major changes to the aquarium.

Is It Good for a Community Tank?

Concept Aquariums

An excellent community fish when kept in a proper group. Good companions include Black Neon Tetras, peaceful rasboras, Corydoras and dwarf cichlids.

Species Variations and Albino Forms

Colour ranges from orange-red to deep crimson depending on sex, condition and lighting. Long-fin or albino strains are not standard, reliably available forms of this species.

Ease of Care

Care level: Beginner. Success depends on choosing healthy stock, avoiding overcrowding and ensuring every fish receives suitable food. Observe the group daily for clamped fins, unusual hiding, rapid breathing or weight loss.

Frequently Asked Questions

How many Red Phantom Tetra should be kept together?

Follow the species’ social needs described above and provide enough room for natural displays, feeding and escape from dominant individuals. A proper group usually produces more confident behaviour than keeping only one or two schooling fish.

Can Red Phantom Tetra live in a beginner aquarium?

The listed care rating is a useful guide, but even beginner-friendly fish need a cycled tank and stable water. Species rated intermediate often have special feeding, flow or social requirements that should be prepared before purchase.

What is the best way to introduce Red Phantom Tetra?

Dim the aquarium lights, acclimate gradually, and release the fish near cover. Feed lightly on the first day and watch existing tank mates for chasing or food competition.