Exploring Popular Community Catfish for Your Aquarium

Catfish offer unique charm to community aquariums, thanks to their distinct whiskers and roles in maintaining tank cleanliness. While some species may be too large or aggressive for community settings, a range of smaller catfish are perfectly suited for a harmonious aquatic environment. Below, we'll discuss five popular varieties widely available at pet stores that make excellent companions in community tanks.

1. Cory Catfish

Corydoras splendens (emerald cory catfish)

Cory catfish are a staple in community aquariums due to their friendly demeanor and fascinating behaviors. This genus comprises over 160 species, each displaying a variety of colors and patterns. Common types include the bronze cory, albino cory, panda cory, emerald green cory, and peppered cory.

These bottom-dwellers, often measuring between 1–3 inches (3–8 cm), are known for their quirky personalities and social behaviors. They thrive in groups, so it's advisable to keep at least six individuals of the same species in a 20-gallon tank. Most corydoras prefer temperatures of 72–82°F (22–28°C) and a pH range of 6.5–7.8. Feed them a varied diet including sinking wafers, frozen bloodworms, and freeze-dried tubifex worms for optimal health. For detailed care, refer to our care guide and our selection of top corydoras.

2. Otocinclus Catfish

Otocinclus catfish, commonly known as “otos,” excel at algae control in aquariums. With about 20 species in the Otocinclus genus, they're well-suited for mature tanks where soft green algae proliferate. These fish prefer pH levels between 6.0–7.5 and temperatures of 70-79°F (21-26°C).

Otos are typically 1.5 to 2 inches (4–5 cm) long and do best when kept with other small, peaceful species like chili rasboras and cherry shrimp. Contrary to their reputation for fragility, healthy otos can thrive once they adapt to their new environment. To keep them in peak condition, offer a variety of foods such as Repashy Soilent Green, blanched zucchini, and canned green beans. For more insights on their care, check out our dedicated article.

3. Glass Catfish

Kryptopterus vitreolus

The Asian glass catfish, also known as ghost catfish, is notable for its translucent body, which makes its internal structure visible. Typically around 2.5 inches (6.5 cm) in size, these shy fish thrive in groups of six or more and benefit from ample aquatic vegetation for hiding spots.

Glass catfish require a minimum tank size of 20 gallons, with temperatures ranging from 72–82°F (22–28°C) and mildly acidic to neutral water. Due to their small mouths, they do well with fine foods like fish flakes and baby brine shrimp. Compatible with many community fish, they get along well with tetras and smaller gouramis.

4. Upside-Down Catfish

Synodontis nigriventris

Originating from West Africa, the upside-down catfish exhibits an unusual swimming behavior, often resting and foraging upside-down under rocks and branches. This fish typically grows to 3-4 inches (7.5–10 cm) and thrives in spacious tanks of at least 30 gallons, featuring diverse hardscape elements and broad-leaved plants for hiding.

They prefer water with a pH from 6–8, temperatures between 72–82°F (22–28°C), and can coexist with various peaceful or semi-aggressive fish that are larger than them, like Congo tetras. Their versatile feeding habits allow them to consume a wide range of fish food, including pellets and frozen offerings.

5. Pictus Catfish

Pimelodus pictus

For larger tanks, the pictus catfish stands out with its distinctive silvery body adorned with black spots. Growing as large as 4–6 inches (10–15 cm), this active swimmer requires a tank over 4 feet long, with dim lighting and robust plants for cover. They thrive in temperatures of 72–78°F (22–26°C) and a pH range of 6–8.

Pictus catfish can be fed a varied diet filled with meaty foods while monitoring portion sizes to prevent obesity. Compatibility-wise, they do best with similarly sized fishes like barbs and mollies that won’t pick at their whiskers or pose a threat.

Bonus: Plecostomus

Female bristlenose pleco

Plecostomus, commonly known as plecos, encompass over 500 species, characterized by their armored bodies and strong suckermouths. While many mistakenly opt for the common pleco, which can grow up to two feet, the bristlenose pleco and rubber nose pleco are better choices for typical community tanks, staying within a manageable 4-6 inches (10-15 cm).

These nocturnal creatures prefer dim settings and appreciate caves and hiding spots. They thrive in tropical conditions, typically found between temperatures of 74–80°F (23–27°C) and a pH of 6.5–7.5, requiring a balanced diet of sinking foods and fresh vegetables. For more detailed information, check out our plecostomus article.

These fascinating catfish can significantly enhance your community aquarium. Though Aquarium Co-Op doesn’t ship live fish, we encourage exploring our preferred online retailers for top-notch aquatic companions.