Is it prefinished wood flooring? Meaning just slap it all together? Or is it raw wood where they're going to sand it all down afterwards, then finish it with a coating? If it's just buy a bunch of boxes of the stuff put it down, tada we're done, then unless the flooring is going under where the tank is I wouldn't worry, maybe put a cloth over the top to prevent any construction debris from getting in there. If they're going to sand the floors down and then finish them, then that's where issues could arise.