For a 180 I personally would get:
30 astrea
30 cerith
15 Scarlet Hermits
15 nassarius
2 or 3 urchins (rock-boring, pincushion, tuxedo, etc)
cucumber if you have a sandbed
Problem with nassarius IMO is that they eat leftover food, which shouldnt be settling out in your tank anyway.
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One day I'll be so rich I'll have a closed loop and Tunzes to mix my new saltwater!
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