Frozen acrylic marks on sump?

[PensacolaReefer]

So I am planning on setting up a 80 gallon tank and picked up this used sump last night from someone locally. I got a great deal but part of the acrylic looks "strange". It's not cracked but not clear..maybe where some water froze on it during storage. Should I be worried about integrity. I can't feel it with my finger so I'm thinking it's fine but wanted the opinion of the community.
Thanks!

 

[cromag27 Verified Sponsor]

Crazing maybe? do you have an up close photo?

 

[PensacolaReefer]

Those are the best pictures i could muster with my iPhone. It holds water fine so I'm guessing its fine. Thanks for the response cromag.

 

[Jasonnew2reefing]

Hey not trying to bash the brand sump...I have the exact same one and the corners are not welded good and I'm afraid it will break over time.. Just fyi

 

[cromag27 Verified Sponsor]

Just keep your eye on it and make sure it doesn't get bigger.