i would go with them i have 3 and there always swimming and always moving together really peaceful and not to overly agressive but active.. thay are best kept in schools of 15 or more. and if you ever have a water problem there nose losses it color probley time to change the water even if oxygen gets low. I cant find them around here or i would get another 25. Ibeen looking for 4 months now. i paid between 5 & $6 4 3 of them. there calmer than the Danio and more actice than neon tetra.http://www.aquahobby.com/gallery/e_rummy.php10-15 Rummy-nose tetras.