My vagabond butterfly died on me!

[Cardinal Tetra]

Bought my vagabond butterfly last Sunday. Had it for about a week, and it was feeding on flakes, frozen brine shrimp and frozen mysis since the day I bought it.

Just now, came back at 3am to find my butterfly dead.

It was fine when I left the house at 7pm. Feeding normally and everything. Took 2 pics of the dead fish. Appears to have some puncture wound on its body. I suspect it could be my clarkii clown as I've seen it chase it a couple of times.

So, just want to reassure if its a puncture wound? Or could it be cyanide posioning?

Tank inhabitants include:

9 chromis

1 clarkii clown

1 bi dottyback

1 flame goby

2 turbo snails

Looks like a puncture wond at the bottom left of the fish. Did some brightening and sharpening to the pic. Its the best I could do, sorry for the poor pic as I was using my hp camera.

[Cardinal Tetra]

Closeup but I doubt it has much use.

[alex826768]

i would tink u remove bi-colour is beter .. they r notorious for streesing fish ...