The Red Coral Pencilfish, also known as Nannostomus mortenthaleri, is a stunning and vibrant species that will add a pop of color to your aquarium. Here's everything you need to know about these captivating fish:

• Appearance: The Red Coral Pencilfish is named for its vibrant red coloration, which covers the majority of its body. It has a slender and elongated shape with a distinct pencil-like appearance. The fins of the Red Coral Pencilfish are translucent, and the males often display more intense coloration and longer fins than the females.

• Size: These fish are relatively small, typically reaching a maximum length of around 5-6 centimeters (2-2.5 inches) in captivity. Their small size makes them suitable for smaller aquarium setups or community tanks with other peaceful fish species.

• Behavior: Red Coral Pencilfish are generally peaceful and shoaling fish, meaning they prefer to be kept in groups of at least 6-8 individuals. They are active swimmers and spend most of their time in the middle to upper levels of the aquarium. These fish are known for their calm and non-aggressive nature, making them suitable for community aquariums.

• Water Conditions: Red Coral Pencilfish thrive in well-maintained aquariums with stable water parameters. They prefer slightly acidic to neutral water with a pH range of 6.0-7.0. The water temperature should be kept between 24-28°C (75-82°F). It's important to provide a well-filtered aquarium with regular water changes to maintain good water quality.

• Tank Setup: Create a natural and peaceful environment for your Red Coral Pencilfish by incorporating live plants, driftwood, and leaf litter. These fish appreciate areas with dense vegetation and shaded spots to retreat to. Adding floating plants can help diffuse the lighting and create a more natural habitat for them.

• Feeding: Red Coral Pencilfish are omnivorous and have a preference for small live and frozen foods. They will eagerly accept high-quality flake or pellet foods, as well as frozen or live foods such as daphnia, brine shrimp, and small insects. It's recommended to offer a varied diet to ensure their nutritional needs are met.

• Tank Mates: Red Coral Pencilfish are generally peaceful and can be kept with other small, non-aggressive fish species. Suitable tank mates include peaceful tetras, rasboras, dwarf cichlids, and small peaceful catfish. Avoid keeping them with larger, aggressive species or fin-nippers.

• Breeding: Breeding Red Coral Pencilfish can be challenging and requires specific conditions. To encourage breeding, provide them with soft, acidic water and a well-planted aquarium. The addition of spawning mops or fine-leaved plants can provide suitable spawning sites. The females will scatter their eggs among the plants, and the fry should be fed small live or frozen foods.

The Red Coral Pencilfish is a beautiful and peaceful addition to any aquarium. With their vibrant red coloration and graceful presence, they will surely capture the attention of any observer. Providing them with suitable tank mates, proper water conditions, and a well-decorated environment will help them thrive and showcase their natural beauty.