Ruby Red Pencilfish
The ruby red pencilfish, or coral red pencilfish, ranks up there with the rare espei pencilfish as one of the holy grails among pencilfish enthusiasts. Common pencilfish are generally grouped with tetras, since they share similar size and schooling characteristics. Ruby reds display a deep, deep red color and are only found in a few protected tributaries of the Peruvian Amazon basin.
Quick Facts
| Scientific Name | Nannostomus mortenthaleri |
|---|---|
| Origin | Peruvian Amazon (Nanay River region) |
| Care Level | Moderate to difficult (needs soft, acidic water) |
| Temperament | Peaceful (shy) |
| Adult Size | Up to 2.5 inches |
FAQ
What makes the ruby red pencilfish special compared to other pencilfish?
Ruby red pencilfish are distinguished by their deep, vibrant red coloration, which is rare and only found in specific protected tributaries of the Peruvian Amazon basin. They are considered a prized species among aquarium enthusiasts due to their striking appearance and limited natural habitat.
What kind of water conditions does the ruby red pencilfish require?
The ruby red pencilfish requires soft, acidic water with a pH between 5.5 and 6.5. It is sensitive to hard water and high temperatures, so maintaining stable, slightly acidic conditions is essential for its health and coloration.
Can ruby red pencilfish be kept with other fish?
Yes, they can be kept with peaceful, non-aggressive species that do not compete for space or food. Due to their shy nature, they should be housed in a well-planted tank with plenty of hiding spots to reduce stress.
Leah Kerr –
The ruby red pencilfish is a stunning addition to my aquarium. Its deep red color stands out beautifully in the tank. I’ve maintained soft, acidic water and it’s been thriving for over six months. The fish is shy but active, and it enjoys the plants and hiding spots I’ve added.
Liam Underwood –
I was excited to get this fish after reading about its rarity. It’s a bit delicate and requires careful water parameters, but once I adjusted the pH and used a soft substrate, it adapted well. The color is vibrant and it’s become a highlight in my community tank.
Ruth Hodges –
This is one of the most beautiful fish I’ve ever kept. The red hue is intense and natural. I keep it in a 10-gallon tank with dense plants and it seems comfortable. It doesn’t swim much but stays near the back, which I find peaceful.