I have a friend at work who "HAD" 2/55 gal. aquariums, both of which leaked out after a period of years in his home. I also discovered, during conversing with him, that he recently had moved these aquariums to new locations in his home. One of them leaked out about 6 months ago, and the other one leaked out about 2 weeks ago. This has me very concerned because obviously I do not want to deal with this kind of disaster in my home. My question is, what is most likely to cause an aquarium to leak, and what are the chances that an aquarium will leak even if it is never moved?? I almost want to transfer all of the fish to a holding tank and double "reseal" my tank just for safety measures. Thank you for your expert opinions on my concerns.