I work at petco and if a customer returns a leaking tank the policy is to throw it away. I dumpster dive these tanks and have a 75gal and 55gal. I was originally thinking of just resealing them and selling them. I was also thinking of turning the 55gal into a custom sump and selling it. The tanks were free for me and I already have supplies and experiance for resealing. Is there money in getting these tanks fully set up and selling them to a buisness?