Came home to find a tentacle from my rose anemone on the substrate, still moving and apparently alive. Looking closer, I noticed that two more tentacles were attached merely by black tissue to the animal. What is causing this? Will the tentacle regenerate into a new animal? Otherwise the anemone seems healthy and well and water parameters all within normal range. Any feedback would be appreciated as I've never witnessed this in the 3 years of having kept 2 varieties of anemones.