科: Lebiasinidae
三线铅笔鱼为小鲑脂鲤科鱼类，原生分布于南美洲。成体约 4.5–6.6 cm，适宜水温 23–28 °C。
A Lebiasinidae species native to South America: Nannostomus trifasciatus lives upper; surface-oriented over blackwater streams and flooded forest margins. Mostly peaceful; males spar briefly. Adults reach 4.5–6.6 cm. It is one of the aquarium-kept Nannostomus species we profile, alongside Nannostomus beckfordi, Nannostomus eques, Nannostomus harrisoni.
中等难度，稳定水质比高端设备更关键。Mostly peaceful; males spar briefly，Keep in groups of 6 or more。
保持 23–28 °C 并避免波动，pH 5.8–7.5、GH 5–19 dGH 即可。
成体约 4.5–6.6 cm，属Upper; surface-oriented鱼类，建议至少 52 L 缸体。
Carnivore-leaning omnivore; small foods。它在Dark sand and leaf litter上自然觅食，投喂可少量多次。
Mostly peaceful; males spar briefly；Keep in groups of 6 or more。理想混养对象：Similar-sized peaceful community fish — Similar size and water needs。需避开Much smaller fish — May outcompete or bully tiny tankmates。
分布于南美洲：Blackwater streams and flooded forest margins，Still to gentle current。
该物种会跳缸——缸盖务必盖紧，换水时尤其注意。
Egg-scatterer among fine plants。Males more colourful。