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Freshwater fishGlass Knifefish
Glass Knifefish
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The Transparent knifefish, or simply the Glass knifefish, loves live black worms, but the species will adapt to frozen foods. In the fish tank, these are marvelous creatures with unique movement. Knifefish are fragile to ship, and please transition slowly to the aquarium; they are sensitive to sudden pH and temperature changes. Please ensure the aquarium is at least 30 gallons. These fish are more active at night, but will use their electrolocation powers to scavenge for food during the day.
Quick Facts
| Scientific Name | Eigenmannia virescens |
| Origin | South America |
| Care Level | Moderate |
| Temperament | Peaceful |
| Adult Size | Up to 8–12" |
| Lifespan | 10–12 years |
| Diet | Carnivore (small meaty foods) |
| Water Temperature | 72–82°F |
| pH | 6.0–7.5 |
| Group Size | Single or group |
| Shipping Size | Approx. 3–4" |
Care Guide
Tank setup: Give them plants, driftwood and tubes or caves to hide in, plus dim lighting. They are most active at night.
Feeding: Feed frozen foods like bloodworms and brine shrimp once a day. Some learn to take sinking pellets.
Tankmates: They are shy and peaceful, so keep them with calm community fish too large to fit in their mouth.
Good to know: Glass knifefish are see-through and do well in a small group, where they hover together.
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