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it's hard to see in your picture , but than you said squid like and this is what came to mind , do they look like either of these 2 picts , the first pict is a baby serpent star , the second pict is a baby brittle star ,
if they look like either of these 2 picts they are harmless ,
if neither of these match get a better pict for a better Id
I would have said the same thing, except for all of those tentacles. I once had a swimming anemone in my sump. It didn't look like this, but it had many tentacles and a brown body.
Here he was....