Hi all, it's me again

I'm reading a book by Julian Sprung and it says that splashes from a sw tank can damage the floor. How often does it happen? Can I cover it somehow to prevent it? And also it says that fish tanks placed close to the wall can damage the paint (it will bubble in a couple of years) SCARY! Is it true? If my tank (if I ever get one) does some damage to anything I'm dead!
Jenna