Anemone and clam

[One of my Macrodactyla (long-tentacled) anemones has attatched itself to the shell of our Crocea clam. The clam does not seem to be in any distress like he appeared to be when our Condylactus got near it. Will this be harmful to the clam?]
 
[How interesting, my bta attached itself to my crocea a couple of weeks ago. So far the clam seems unaffected so I havent worried about it.]
 
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