The one by the heater looks like a Chocolate Chip Seastar. They are carnivorous to sessile inverts and snails so be careful.
Sand Sifting Seastars are also carnivorous to creatures within the sandbed.
Make sure your salinity is 1.026 as they do best at natural seawater salinity. Check it with a refractometer and not a swing arm hydrometer.
Cheers,
Tim
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