What looks like a hairline crack on my tank

[meldogg]

I have a 3 gallon tank and it looks to have a hairline crack going up the side on the outside of the tank. It is very small and I can feel it but can’t catch my fingernail on it or anything. Do I need a new fishtank?

 

[lapin]

No, but if it lets go then you will have an issue.

 

[Garf]

A crack would go all the way through. You sure it’s not a scratch?