GLASS CATFISH (Kryptopterus bicirrhis) 1.25-1.75" 3.5-4cm A2404T

Generally peaceful though it may predate on smaller fishes and is somewhat timid so does not compete well with much larger, robust or otherwise boisterous species.

Peaceful, comparably-sized cyprinids, loaches and other catfishes perhaps constitute the best options but be sure to research your choices thoroughly prior to purchase.

K. bichirris is gregarious and tends to form schools so ideally four or more specimens should be purchased.

https://www.seriouslyfish.com/species/kryptopterus-bicirrhis/