Let's name them!? They're all tiger barbs, but of different color variations.
1) Murderous, normal color pattern [ click here to see ]
2) Same color pattern, new.
3) Albino. New. [ click here to see ]
4) Green. New. [ click here to see. ]
You can always name the murderous fish Killer. lol
Aren't you meant to keep tiger barbs in groups of five or more? Otherwise they have a tendency to rip each other to shreds.
Name the 3rd on Abby the Albino.