You need to swap out the broken pane at least. A chip is bad news, even if it is small. New a guy few years back that chipped his 250 just barely, even less that yours. His tank lasted 6 months I think, but when it finally broka he not only had to replace all of his fish, coral, and tank, but his carpet on both floors, cause his tank was upstairs. Besides how much more of a legit excuse could you give the wife for hooking yourself up with that new tank you've been talking about for a long time!