Astneria Starfish- I have those as well but they appear to be harmless, makes me think that maybe there are two similar species....
Vermatid Snail- destroyed it with pliers quick and easy, not really harmful, just an irritant
Aptasia - had 3 of them on my corea clam --> just add peppermint shrimp all gone within 3 days
Planaria Flatworms - had a few on my black suncoral (even after I coral Rx'ed it!) just recently added a Flatwormicide...Lost my stomatella snails in the process even after a 30% water change ony 30min after adding the stuff
Zooanthid eating nudibranchs- I had many! it took me a while to figure out what they were but I set up a zoo hospital! basically did 5min freshwater dips in RO water and scrubbed with a toothbrush to remove eggs. Didn't lose a single polyp
