I am new to this forum and to aquariums and fish in general. I recently set up a 29 gallon freshwater tank and have had water in it for about 5 days now. I added my first fish to the tank last night (2 marble mollies and 2 high fin platys). Today I noticed a tiny (1/16") crack on the front panel of the glass tank. I may have missed this when setting up the tank or it may have occurred overnight, I'm not too sure. The crack is only on the inside at this point (I can feel it with my fingernail) and is about 1/3 of the way down from the top. I think I am going to take out some water so the water line is below the crack, just in case. But my big concern is that this will expand to the outside of the tank and cause a leak and a major headache. Should I replace the tank? I am very concerned about this right now, I don't want to wake up tomorrow to a wet carpet. Any help or suggestions would be appreciated, thank you.