Glass Catfish Twin

Kryptopterus geminus

Photo of aquarium fish Glass Catfish Twin
Natural range
  • Mekong River Basin
  • Cambodia
  • Laos
  • Thailand
  • Vietnam
Catfish Conservation status: Least concern LC

Family:Sheatfishes (Siluridae)

Kryptopterus geminus, known as the Glass Catfish Twin, is a representative of the family Siluridae (Catfishes). Its name "twin" is due to its close relationship with another, quite popular species – the Ghost Glass Catfish. Interestingly, these two species were formerly considered one. In retail stores, they are often confused, but this error does not lead to problems, as their keeping requirements are similar.

Required aquarium volume
from 250 L
Size in aquarium
17 cm
Temperature
20 – 28 °C
Temperament
Semi-peaceful
Parameters
Temperature20 – 28 °C
Water pHSlightly acidic (6) – Neutral (7.5)
Water dHVery soft (2) – Hard (15)
Water salinityno salt (freshwater)
Size in aquarium17 cm
Lifespan5 years
TemperamentSemi-peaceful
Toward small fisha risk to small fish
Required aquarium volumefrom 250 L
Lightingdimmed
Substrateany (no restrictions)
Water flowweak or moderate
Swimming levelmiddle level
FeedingAny (universal)
KeepingSmall group
Jumpinglow

Frequently asked questions

The essentials: size, tank volume, water parameters and care

How big does Glass Catfish Twin get?

An adult reaches 17 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.

What size aquarium does Glass Catfish Twin need?

The recommended volume is 250 L. A smaller tank speeds up nitrate build-up and raises stress levels.

What water parameters does Glass Catfish Twin need?

Temperature 20–28 °C, pH 6–7.5, hardness 2–15 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.

How long does Glass Catfish Twin live?

Around 5 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.

Is Glass Catfish Twin aggressive?

Temperament: semi-peaceful (dangerous to smaller ones). Not a predatory species, but small fish that fit in its mouth will eventually be eaten.

How many Glass Catfish Twin should be kept together?

Recommended setup: small group (3–4 individuals). Ignoring this is a common cause of stress and disease.

What does Glass Catfish Twin eat?

Diet type: any (universal). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.

What is the scientific name of Glass Catfish Twin?

The scientific name of the species is Kryptopterus geminus, family Sheatfishes (Siluridae).

Plants and this fish

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