I have had asternia stars in my tank for a few months now, but I can never "see" more than 5 or 6 at a time. I have noticed that they are missing legs now and again, probably due to being fed on my the odd hermit crab. I like looking at them and they seem totally harmless. I'd be worried that introducing a harlequin shrimp would result in the stars being totally wiped out, and the shrimp subsequently starving.
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