Ouch! Jeez man, that sucks!
But I Wouldn't go throwing away your tank!
When i reseal tanks, I use ordinary clear silicone sealant. There are aquarium silicone sealants for sale, but they are more expensive, and i've never encountered a problem with regular old hardware store clear silicone sealant. (don't use window caulk {it won't work} or black silicone {it looks terrible})
Before you apply the sealant, go around the tank with a razor blade, and remove as much as the old silicone as possible. ( you may need to wrap the outside of the tank in duck tape to keep it from falling apart once the old silicone's removed.) Then yyou can go along all the seams with your new silicone.
Good luck, man!