Red Spotted Cardinal Fish - Medium

Red Spotted Cardinal Fish

The Red Spotted Cardinalfish is a brilliant and delicate marine nano species that makes a stunning addition to any reef or peaceful marine aquarium. With their compact size, peaceful nature, and vibrant ruby-red spotting, these fish offer a pop of colour and activity to the mid-to-bottom levels of the tank. Native to coral-rich zones in the Indo-Pacific, these cardinals are especially loved by aquarists for their schooling behaviour and reef compatibility.

Visually, the Red Spotted Cardinal has a translucent pink to silver body adorned with bright red dots and speckling along its flanks and fins. Their large reflective eyes and subtle shimmer give them an ethereal quality when swimming under reef lights. While small in size, only reaching about 4-5 cm, what they lack in stature they make up for in personality and elegance. These fish thrive in groups and show best when kept in small shoals where their natural schooling behaviour can shine.

Being peaceful and shy, they do best in calm reef environments with low aggression and plenty of hiding places such as live rock caves, overhangs, and shaded areas. They are nocturnal by nature but quickly adapt to the aquarium's schedule. Though breeding in home aquaria is uncommon, cardinalfish are mouthbrooders where the male incubates the fertilised eggs in his mouth for protection until the fry are released.

Tank Recommendations for your Red Spotted Cardinal Fish

Due to their small size and social nature, a group of Red Spotted Cardinals can be comfortably housed in a marine aquarium starting at 80 litres. Ideally, a tank with plenty of live rock and shaded hiding places will help reduce stress. These cardinals prefer subdued lighting and gentle flow, which mimics their natural reef crevices and overhang habitats. Stable water quality is crucial, and as reef-safe fish, they make an excellent addition to coral-focused setups.

Suitable Tank Buddies

Red Spotted Cardinalfish are incredibly peaceful and best kept with non-aggressive species in reef or nano community tanks. Their timid nature means they do best when kept in groups of 5 or more to feel secure and reduce nervous behaviour.

Usually Compatible

Clownfish, gobies, firefish, chromis, blennies, shrimp gobies, and peaceful reef-safe wrasses.

Sometimes Compatible

More active or semi-aggressive species like dottybacks or larger damsels may outcompete them for food or stress them if not introduced carefully.

Rarely Compatible

Predatory species such as lionfish, groupers, triggers, or aggressive hawkfish may prey on or intimidate cardinalfish.

Feeding your Red Spotted Cardinal Fish

These cardinals are carnivorous micro-predators and prefer small meaty offerings. They readily accept frozen foods like mysis shrimp, enriched brine shrimp, copepods, and finely chopped seafood. Some may take to high-quality micro pellets over time. For best results, feed twice daily with a variety of protein-rich foods to maintain colour and health.