Weird bump on my Silver gar.... help me out ?

[orroram]

ye so i dunno what this bump is but i noticed it shortly after buying it.

lemi know what you think..

http://img21.imageshack.us/img21/4795/gars.jpg


its right by the end of the tail.

thanks guys.

 

[bigspizz]

Looks like swallowed substrate. Feel it softly and see if it is hard.

 

[orroram]

ye , but hes eating fine and everything, and so im thinking it would have passed threw his system by now if it was somthing he swallowed.