1. Stay hydrated. You're surrounded by a vast ocean of water, and it's a good thing you don't need lungs.
2. Don't get too attached to your neighbors. It's not like you're going to be there forever. Or even for a day. You're going to be digested.
3. Learn to appreciate the simple things. Like a warm patch of skin, or a gentle breeze in your biofilm.
Learn more about Colonial Protocol or Bacteria Hierarchy
Or, if you're feeling adventurous, try Bacteria Exploration!