I have some very small what I think are anemones in my tank...3 of them all about the size of a "finish nail" head....maybe 1-2 mm across....just wondering if anyone knew what kind they might be...brown body with long brown tentacles....and a luminescent green mouth/center...there were 2 a few days ago and now three so they're starting to split....just wondering if they should be removed.....one has moved almost 4 inches in 24 hrs....quite a bit for something that size