This fish came in a bag of croaking g gouramis I got at a recent auction. Without knowing what it is, poor little did is sitting in a tiny little breeder box until I can find out who the seller is, or find out he is peaceful.
Adorable little thing. I'd also guess a smaller species of cichlid. May be too young to tell the species so I'd grow it out. I doubt it will cause any harm to your other fish, it looks tiny and everything about it says harmless to me.
Definitely a cichlid, and definitely too soon to tell. Even if it's mbuna, it's agressive instincts might not be as strong if raised with more peaceful fish. What size is your tank? It should grow pretty fast if it's a large tank.