06-04-2013, 11:36 PM
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Any sharp objects in the tank's bottom (wood, branches, rock, gravel etc)... If other fish aren't being aggressive, perhaps the lil guy became startled by outside movement, light change, etc, and darted over something. If he/she is exhibiting normal swim behavior, the injury doesn't look too serious (kinda hard to tell in the pic) and I wouldn't be too concerned... But if he/she appears lethargic or swims oddly, may want to look into a quarantined treatment (as like all organisms) fish are susceptible to disease/infection when seriously injured...
What other fish do u have in there? Also, what type of decorations are present?