Has anyone ever kept Dwarf Neon Rainbows (Melanotaenia praecox) with goldfish?
I have 4 fancy goldfish (either Fantails, Orandas, or some sort of hybrid of the two). They are around 4–5 inches each. I also have a school of 8 Dwarf Neon Rainbows in another tank (2 males, 6 females).
The rainbows are super sensitive to CO₂. The moment I cross around 30 ppm in my planted tank, I can see them struggling, so I’m thinking of shifting them to the goldfish tank, which has no CO₂.
The goldfish tank is 300 litres (4 × 2 × 2 ft / 80 gallons), and the rainbows are around 1.5–1.75 inches.
Usually people say no to goldfish tank mates, mainly because of a mismatch in temperature or temperament. But in this case:
I have 4 fancy goldfish (either Fantails, Orandas, or some sort of hybrid of the two). They are around 4–5 inches each. I also have a school of 8 Dwarf Neon Rainbows in another tank (2 males, 6 females).
The rainbows are super sensitive to CO₂. The moment I cross around 30 ppm in my planted tank, I can see them struggling, so I’m thinking of shifting them to the goldfish tank, which has no CO₂.
The goldfish tank is 300 litres (4 × 2 × 2 ft / 80 gallons), and the rainbows are around 1.5–1.75 inches.
Usually people say no to goldfish tank mates, mainly because of a mismatch in temperature or temperament. But in this case:
- The goldies cannot possibly eat the rainbows at their current size.
- The rainbows don’t fin nip, or at least I’ve never seen them do it.
- The water parameters in both tanks are quite similar.
- Goldfish tank: GH 6, KH 2
- Current rainbow tank: GH 4, KH 0
- Temperature is pretty much the same in both tanks: 24–25°C (74–77°F).
I would expect your praecox to be quite a bit shorter lived in their environment unless you have superb filtration.
