OMG this is a train wreak about to happen, this tank is a nightmare about to happen. If the top just pops off like that believe me the rest can pop apart like that also ,not prepped right, and not glued right,t top is also not braced right, this tank bad news .Any body that tells you gluing or as it is called welding this is a piece of cake let them get a hold of me here and we can debate it.SORRY you can not reseal a acrylic tank buy putting number 4 like water thin solvent around or #16 or 2 part 40.different cast acrylics and there thickness determines the glue. I have fixed other crap acrylic jobs with minor leaks with a square acrylic rod and 40 but with this tank, put frogs or a snake in it.