Suggestions on Livestock

[lloyd <><]

Hi, it's a 20 gallon standard 24x12x16
heavily stocked with various macroalgae and gorgonians/sea fans
What inverts can I add other than shrimps, crabs (definitely not crabs), Tridacna Clams, and Feather Dusters to liven up the tank?
Thanks!
Lloyd <><

[nanoreef1]

Sand Dollar

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[lloyd <><]

I don't have the deep sand bed for it, it does look beautiful though, thanks