The Rock Anemone (or Flower Anemone) is an interesting creature. It likes meaty foods, but doesn't grow much larger than 4" in diameter. The base is locked firmly in a crevice, but it changes shape quite quickly. During feedings, the mouth enlarges and resembles two lips. They come in various colors - I've seen brown/green, light green, and orange. It is quite sticky and will eat anything that ventures too closely.
No, this is not a Ritteri. young Bubble Tip Anemones have bubbles at the end of their tentacles, but as they age, those often go away. This anemone is over 13 months old, and soaked up the light from 165w PC lighting. I used to feed it meaty foods every three days, but I backed off as it grew too large for my 29g tank. This is a fairly hardy anemone, but it needs good-to-great water conditions and adequate lighting(VHO, PH or MH). It may consume phytoplankton as well. Reef-safe.
The Copperband Butterfly fish is a good hunter of aiptasia (pest anemones) in the reef.
Rose BTA anemone are pink, but this particular strain is called a Sherman Rose BTA. People love it because of the vivid color of its tentacles.
Peppermint Shrimp - Lysmata wurdemanni -are often sought after because they tend to eat small aiptasia in the reef. While most LFS will carry these, some are possibly mistakenly sold as Peppermints when in fact they are Camelback shrimp. Camelbacks have a hump that is quite distinct when the animal is viewed from the side rather than from above (as pictured here). They do not harm most corals and fish tend to ignore them. They are usually only visible late at night with a flashlight, as they hide in the rockwork all day long.