Can Common otocinclus Live With Siamese flying fox?

Detailed assessment

Both Common otocinclus and Siamese flying fox share a comfortable temperature range of 23–25°C (Common otocinclus prefers 20–25°C, Siamese flying fox prefers 23–27°C). Their pH ranges overlap well at 6–7.5, so water chemistry is compatible. Both species have low aggression scores (Common otocinclus: 1, Siamese flying fox: 1 out of 5), which supports peaceful cohabitation. They occupy different water columns (Common otocinclus: bottom, Siamese flying fox: middle), which reduces direct competition for space. The size difference is significant: Siamese flying fox reaches 16 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.