The bottom picture leads me to believe they are just harmless polyps. Aptasia looks sort of similar but I cant tell from the picture. Aptasia generally have a different color on the very tip; indicating it can sting just as you see on the very tip of a BTA or other anemones.
Edit: If these are as brown as the bottom pic looks I would doubt they are Aptasia, my Aptasia are more translucent pink with tiny white splotches and feint white tips.