I'll give you my opinion, but I am only about 6 monthss into this hobby myself, but have done LOTS of reading and research. I have a 120g.
Remember, this is only my opinion:
- One Tang only. I think the Hippo is out of the question, only due to the fact that they will outgrow the tank. Smaller tangs to look at are: Kole Tang, Yellow tang, like you said, Tomini Tang, Purple tang all would be fine in that size tank, but only one.
- Mandarin Gobies are pretty hard to keep, unless you can get them to eat prepared foods. They will wipe out the pod population in no time and then slowly starve to death. I would seriously reconsider that, even in spite of the fact of having a refugium.
- I have a false perc and love him, great personality, will be getting him a mate very soon. I would recommend getting a pair.
- 6 line is 50/50 whether or not you will get a peaceful one or one that will bully other fish and/or nip corals and clams. Do some research here about them. I wanted the same thing till I spent some time researching them here. I have an extremely peaceful set-up and would/did choose corals and clams over the 6-line. Also, they are known to jump.
- Don't know anything about the Coral Beauty, sorry. Or any of the next 4 fish.
- I have 3
Flasher Wrasse and they are gorgeous fish, IMO, but they are high strung and known jumpers. Unless you have alot of rockwork and hiding places for them, they will eventually jump out.
- Same for the firefish. I have a red/orange one. Beautiful also, but they ping around like the Flashers when startled and eventually will jump out.
I have a canopy on my tank, with a screen mesh across the back to keep my jumpers in, but I also have alot of rockwork and hiding places for them, so they bolt for a hole first, before they try the top, but I have seen them go for the water's surface a few times.
Suggestions:
-
Yellow Watchman Goby has a wonderful personality, as does the Lawnmower Blenny. Both stay around the sandbed and make great tankmates.
- Dragon / Sleeper Banded Goby is great for sandsifting and very fun to watch as he filters sand through this gills.
I would probably do a Yellow Tang, pair of False Percs, YWG, Lawnmower Blenny, Sleeper Banded Goby and possibly a Firefish, along with 1 or 2 more small fish.
Will this be a Fish Only, or a full reef set-up?
Glad to see you have done plenty of research and that you want to do it the right way. You are well on your way to becoming a successful reef keeper. Patience is essential.
Hope this helps some.
By the way, Welcome to TRT!