Couple of them
Love my coral beauty angelfish, basically the mod in the tank, swims around and nobody screws with her but if others are fighting/getting abused she will just swim by and it will stop. Pretty funny to see actually.
Copperband I bought just because it was eating everything, and it turns out when I got it home it also liked aptasia, so that was a plus.
And of course the Lawnmower blenny, one of the most inexpensive fish but looks pretty cool and does an amazing job of keeping all the algaes in the tank in check.
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