I found a pair of used glass tanks in a pawn shop in NE Seattle for only 99.00$ each. They were slightly scratched and the top has small chips in places. No cracks that I could see. They had holes drilled in the bottom. The size was 60" long, 30" deep and 18" front to back. Are used tanks worth the purchase? These two looked well used and professionally made to standards I've read about for new tanks, like reinforcement across the front and back and at the top and edges of the glass at the top, etc. What would be a good price to offer considering the risk of tank failure; either cracking or edge seals are bad and need reworking or replacement?