They are beautiful fish, I have three large ones approx 4" in my plec tank- no issues at all....however
I made a stupid mistake one day of buying 2x batches of neon tetra's one lot for the large plec tank and one lot for my zebra tank.
There were about 20x - week later when walking into dining room i noticed there was no blue cloud swimming around the tank- asked my sis if she had removed anything- answer no.
It suddenly dawned on me what had happened!! To this day i dont know why i put them in and didnt click. Learnt me lesson!
I have some awesome looking black ruby barbs which i think are fantastic looking when coloured up.