A big old wrasse would look awesome in there and be reef safe. Look at the anampses wrasses. They are bigger but are stunners (lennardi, feminus). Also if you want a bit smaller but awesome, get a pair of flasher wrasses, they are stunning when they flash.
I agree the anampses wrasses are amazing and I’ve seen a few in person. But unless I steal one I don’t think I’ll be able to get one on my high school budget. I’m willing to spend a lot of money on this hobby because it’s something i’m passionate about but those are too much for me right now LOL
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