If it's a crack or if it's on the inside, it's toast. If it's a chip on the outside corner (away from the joint), it's marginal, but likely OK. That's a lot of water to have a seam come apart. I would check it out really well.
Well he told me that it held fish before, so i was thinking that it would be okay. But then if I put my fish in their and they bang the tank then I might be sol.Is their a way to maybe fix this??
You might check with a windshield repair company and see what they say. Most claim to be able to fix chips in windshields with some kind of super strong resin...