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I was wondering if you can still use a tank if the top plastic part in the middle of the tank cracked. So now when I fill it up with water the 2 width sides come out like ( with a little less curve instead of being straight.

Thanks.

I wouldnt do it
It creates a chance of a bigger leak and wont be safe

You can try sealing it up with
Aquarium silicone

Maybe if you built a new brace to span the top of the tank. You'd want to reinforce it because water exerts a lot of pressure on tanks.

How big is the tank? Can you post a pic?

Thanks for the answers! =)
I don't have a camera =( Its a 55gallon