Can Dwarf Cory (Tailspot Cory) and Electric Blue Hap Live Together?

Dwarf Cory (Tailspot Cory) is a peaceful species (0/10), while Electric Blue Hap is semi-aggressive (7/10). This notable difference means Electric Blue Hap may occasionally assert dominance over Dwarf Cory (Tailspot Cory).

Large aggression gap (7 points) between Dwarf Cory (Tailspot Cory) and Electric Blue Hap increases stress risk for the more peaceful fish.

Dwarf Cory (Tailspot Cory) and Electric Blue Hap both frequent the Middle (Open Water) and Bottom (Substrate) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

There is a critical concern: the Nano / Bite-sized (Predation Risk) behaviour of one fish directly conflicts with the Piscivore (Eats small/nano fish) trait of the other — piscivorous fish will prey on nano-sized tank mates..

Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion.

The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.

The pH requirements of Dwarf Cory (Tailspot Cory) (6–7.5) and Electric Blue Hap (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.

To house Dwarf Cory (Tailspot Cory) and Electric Blue Hap together, plan for an aquarium of at least 200 litres with a minimum length of 120 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.

Specific environmental needs for this combination include: Sand (Sifters), Plants - Densely covered, Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.

Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.

Dwarf Cory (Tailspot Cory) and Electric Blue Hap are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.