Black ghost vs Northern trout gudgeon: can they live together?

Verdict: Not recommended

• The Northern trout gudgeon can be semi-aggressive or nip fins.
• The Black ghost is aggressive towards other fish.
• The Black ghost grows about twice as long as the Northern trout gudgeon; watch for bullying or predation.
• Both are comfortable at 24–26°C (75–79°F).
• A pH of 6.0–7.8 suits both.