Can Emerald Dwarf Danio and Spotted Raphael Catfish Live Together?

Emerald Dwarf Danio is a peaceful species (1/10), while Spotted Raphael Catfish is peaceful (2/10). This modest difference means Spotted Raphael Catfish may occasionally assert dominance over Emerald Dwarf Danio.

Emerald Dwarf Danio and Spotted Raphael Catfish both frequent the 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.

Additional behavioural considerations to keep in mind: Shrimp eaters may also prey on very small nano fish.

Worth noting: Spotted Raphael Catfish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Emerald Dwarf Danio is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 20°C and 24°C. Aim for the midpoint of this range (around 22.0°C) for optimal comfort.

Both fish can tolerate a pH between 7 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 8–15 dGH. Regular testing will ensure conditions stay within this range.

To house Emerald Dwarf Danio and Spotted Raphael Catfish together, plan for an aquarium of at least 110 litres with a minimum length of 90 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.

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

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

This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Emerald Dwarf Danio and Spotted Raphael Catfish need extra room, more cover, and closer observation during the first few weeks so small aggression, feeding, or territory issues do not snowball into a long-term problem.

Feeding time deserves special attention with this pairing. Spotted Raphael Catfish is a known shrimp eater and may prey on small invertebrates or nano fish like Emerald Dwarf Danio.