Oh MY that is PRETTY!!! Saying that I do worry about the black. It will show any calcium build up. Now YOU know all about water balancing (I wonder who taught you LOL) so it should be fine. You just need to keep a close eye on it.
What color are you thinking of for the grout? White will make each one pop where a medium gray will help them all blend in. Get some grout sticks to play with and see which one SHE likes the best.
What color are you thinking of for the grout? White will make each one pop where a medium gray will help them all blend in. Get some grout sticks to play with and see which one SHE likes the best.