科: Characidae
ルビーテトラ（Axelrodia riesei）はカラシン科に分類される淡水魚で、南米コロンビアに分布する。成魚は約 2.6–3.9 cm、適水温 22–26 °C。
Axelrodia riesei is a Characidae from South America. In the wild it prefers blackwater streams and flooded forest; in the aquarium it stays mostly peaceful. Plan on 2.6–3.9 cm of adult fish at 22–26 °C. In a community tank it pairs well with Similar-sized peaceful community fish.
難易度：中級。Mostly peaceful; larger species predatory。
22–26 °C が目安。急変を避け、Heater for stable tropical warmth。
成魚 2.6–3.9 cm 前後。Middle of the water columnのため 25 L 以上の水槽を推奨。
Omnivore with carnivorous tilt。1日2回の少量給餌が理想的。
可能。Mostly peaceful; larger species predatory。おすすめ：Similar-sized peaceful community fish — Similar size and water needs。Much smaller fish — May outcompete or bully tiny tankmatesとの混泳は避ける。
南米コロンビアのBlackwater streams and flooded forestが生息地。
飛び出しの傾向は低い。標準のふたでOK。
Egg-scatterer among fine plants。Subtle; females fuller-bodied。