a crawfish ??

duck, you wouldn't remember if the shark you saw was either a rainbow shark or a red-tailed shark, would you?

(EDIT: additional text)

duck, if what you saw were either of these sharks (I'm thinking it's quite possible because of the coomon availability of them), it would be a bad idea to add either one to your current set-up. For one, both are pretty territorial, can get up to 5"-6", which is a bit large for a 10 gallon tank.
 
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Rainbows and red-tails are only territorial towards each other, would be fine alone. But yes, the tank is too small based on growth.
 
I once watched my betta pick a fight with my rainbow shark... it just ignored him for about 10 minutes.

Then it suddenly grabbed him, slammed him against a rock, and swam away.

The betta came out after that :)
 
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