I had my bathroom redone last year. Everything is still perfect except for this one tile that popped up just a little bit.Visually it does not bother me at all, but the cracks in the grout worry me and do not look water tight. There are some hairline cracks away from the main cracked up area where the tile is raised. I would like to repair them, but I have not done work with grout before. Should this be an easy fix if I allow the one off tile to lay as it is? What tools and other items would I need?