A reefsafe fish that holds its own?

[ambergris caye]

I have a 75 SPS reeftank with a 6" hippo and 4" yellow tang. I know it is almost too much to have the 2 tangs together but they get along fine. I also have a 2" blue chromis. I tried a sixline wrasse but it disappeared, perhaps because it was too small at 1". I was hoping the wrasse might help if a flatworm problem were to come up. What else could I add for reef fish that might provide beauty and function? The tangs will probably bully a new tankmate. I've considered a foxface lo but have heard they may nip at corals. I like the look of a lot of fish in a tank and have a decent sump/skimmer.

[GoingPostal]

You are overstocked as is and given how territorial tangs are, especially in cramped quarters you are likely going to have a difficult time adding anything. If you like the looked of lots of fish remove the tangs, you can fit multiple suitable sized fish in a 75, tangs and foxfaces are not suitable sized fish for a 4 foot 75 gallon. Both of yours will outgrow that tank and most reef safe fish don't have enough attitude to stand up to two larger aggressives already there so it's hard to recommend anything.