Can Common otocinclus Live With Royal panaque?

Detailed assessment

Both Common otocinclus and Royal panaque share a comfortable temperature range of 22–25°C (Common otocinclus prefers 20–25°C, Royal panaque prefers 22–30°C). Their pH ranges overlap well at 6.5–7.5, so water chemistry is compatible. Both species have low aggression scores (Common otocinclus: 1, Royal panaque: 1 out of 5), which supports peaceful cohabitation. The size difference is significant: Royal panaque reaches 43 cm while Common otocinclus reaches only 3.3 cm, and the larger species may view the smaller one as prey. Note: fish 2x+ larger may eat smaller tankmates. With careful monitoring and adequate tank size these species can usually coexist, but be prepared to separate them if aggression or stress appears.