Help me pick my last fish

I believe most wrasses are jumpers. Yellow tangs normally get along fine with blue tangs. However, since your blue tang has been established for some time now it might be territorial towards any new fish. As mentioned, you can move the rocks around to break up his territory and then add a new fish. This often helps, but is not 100% effective. I have never kept a marine betta but I beleive they will eat pretty much anything smaller than them. Hopefully someone can confirm/deny this.
 
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