Usually my stool sinks but lately its been floating. poop appearance is normal (brown, not oily, cylindrical). no pain when going, no abdominal pain. recently been eating more fiber and started a probiotic. due to lack of symptoms, is this normal?

AS long as you have not lost weight, you should be okay. Probiotics do not have objective evidence of usefulness and are unlikely to be doing your health any good. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.