How many discus fish do you need to keep in an aquarium together? The number can vary based on different situations. However, discus fish can be very social and peaceful among themselves.
Fish can understand Gestalt principles where they can find symmetry and similar patterns. They can form friendships with each another. Hence, keeping only one discus in an aquarium is quite tedious because the fish may feel lonely.
That being said, try to keep a minimum of three* together in one aquarium. The habitat of the aquarium fish is generally social and doesn’t suit a solitary life. To avoid aggression, it’s best to keep them in a group. Avoid keeping pairs in one aquarium. In some clusters, faciating bullying can happen to the pair which leads to higher temperatures of the shoal or flock.
*It is important for a fish keeper to know that owning multiple fishes has a high maintenance cost and this should be taken care of before buying fishes.