I really like my midas blenny. Always out, and very colorfull. I do have a pair of neon gobies as well, that are always out. The last pair I had fought a lot, but these 2 don't fight at all. The problem with them is they have such a short lifespan though.
You could also add a less aggressive clownfish, like the false perc's, true perc's or skunk clowns. Another option is the Hifin Perchlet, or other gobies, like the Randall Goby.
If you do add more wrasse's, there is a risk of fighting. If you had added them all at the same time, it wouldn't have been an issue, but since you already have established wrasse's, they may pick on the newcomer's.
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