Suitable tank mates for the discus aquarium – Harmony in a warm water paradise
Discus fish are undoubtedly the stars of the aquarium – graceful, colorful, and with a majestic presence. But even kings need an entourage – suitable tank mates that fit well into the harmonious overall picture, tolerate the same water conditions, and do not stress or suppress the discus. In this article, you will learn which species are suitable as tank mates for discus – and which are better left out.
Important Criteria for Tank Mates in a Discus Aquarium
Before we get to the selection of suitable species, a brief look at the requirements:
- Water temperature: Discus need 27–29 °C – this is too warm for many fish.
- Social behavior: No hectic, aggressive, or overly dominant species.
- Food competition: Tank mates must not take food away from the discus.
- Water parameters: Soft water with a pH value of 6–7.5.
- Size and behavior: Tank mates should be calm swimmers and leave enough space for the discus.
The Best Tank Mates for Discus:
1. Cardinal Tetras (Paracheirodon axelrodi)
- Temperature tolerant: Yes, up to 30 °C
- Size: 3–5 cm
- Special features: Form beautiful schools, show great colors – especially in contrast to the discus.
- Note: Pay close attention to parasites when introducing them (quarantine recommended).
2. Sterba's Corydoras (Corydoras sterbai)
- Temperature tolerant: Yes, up to 30 °C
- Bottom dwellers: Ideal as scavengers
- Special features: Calm bottom dwellers that don't disturb and like to stay in groups (at least 6 fish).
3. L-Catfish (e.g., L134, L333, L46)
- Temperature tolerant: Depending on the species, many L-catfish come from warm waters
- Function: Algae control, consumption of food leftovers
- Important: Provide hiding places (caves, roots). Do not choose overly aggressive species.
4. Ram Cichlid (Mikrogeophagus ramirezi)
- Temperature tolerant: Perfect at 27–29 °C
- Behavior: Calm, ideal for keeping in pairs
- Tip: Very sensitive to water parameters, so only keep in well-established tanks.
5. Marbled Hatchetfish (Carnegiella strigata)
- Special feature: Surface is often overlooked – these fish utilize it ideally
- Behavior: Schooling fish, very peaceful
- Tip: Cover the tank well, as they can jump!
6. Farlowella or Sturisoma species (Twig or Whiptail Catfish)
- Behavior: Extremely calm, feed on algae growth
- Appearance: Striking, quirky appearance with no territorial behavior
- Temperature: Compatible with discus
What does not fit with Discus
✘ Cichlids from other regions
- Angelfish, Malawi or Tanganyika cichlids are too aggressive or require completely different water parameters.
✘ Guppies, Platies & Co.
- These fish love hard water and lower temperatures – not a good combination.
✘ Skittish schooling fish
- Some tetra species (e.g., Red Phantom Tetras) can be hectic or nip fins.
- Absolutely unsuitable – both in terms of temperature and behavior.
General Tips for Coexistence
- Create enough space: The more fish species, the larger the tank must be. 400 liters upwards are recommended for mixed stocking.
- Always introduce discus first: This way they can establish their territory in peace.
- Acclimate newcomers slowly: Preferably via quarantine to avoid diseases.
- Adjust feeding: Discus eat slowly – hectic tank mates can compete with them for food.
Conclusion – The Right Company for Kings
Discus fish can indeed live with other species – if the conditions are right. Calmness, temperature tolerance, suitable water parameters, and no competitive behavior are the basic requirements. With carefully selected tank mates, a harmonious, diverse, yet discus-friendly aquarium can be created.
Final tip: Less is often more. It is better to choose a few well-suited species than many different fish that get in each other's way.