210g stocking

I am trying to find advice on what to put in our 210g FOWLR. Right now, in other tanks, we have fish that we wanted to put in the tank but wondered about over stocking. I have a 55g sump/fuge, set up with a berlin XL skimmer. The fish we have are as follows:
Panther Grouper ( definitely has to go in the tank due to size at adulthood)
SF Eel
Banana Wrasse
Longhorn Cow ( also a must in the tank)
Foxface Lo
Squirrel fish
Tomato Clown
and a very mean Watchman that I thought wouldn't make it with the guys in the other tank but he swims at them with mouth open if they get too close. Hilarious to watch.
The tank will have 160lbs of sand and 150 lbs of LR. Thanks for any help !!

PS...I know about the cow's toxicity but he is the ruler of the tank. All these guys (except the Lo and the Squirrel ) have been together about 5 months without incident.

 

I have always been a fan of a nice tigger in a larger tank.

 

A good sized Tang will be a nice addition and maybe a Grouper(Miniatus)_I like jtReef's idea of a Trigger also!!!! Just be careful of overstocking and water quality issues!

 

Tangs, Tangs, and more Tangs!, Majestic Angel or Emporer Angel. A pair of Golden Butterfly's and if your game a Moorish Idol which I have found are not as hard to keep as most people say if your willing to make a commitment to keeping them. They must be fed 2-3x's per day with frozen algea, sponge and mussel or clam containing foods as well as a good flake food like formula reef and spirulina flakes.

 

So I will be okay with the entire list going into the tank? Also, I forgot about a 6" powder blue that was given to me with a LR purchase. It is currently in my 55g reef and it either has to go into my 75g when we convert it to reef or the 210. Right now it looks weird being in a tank where the largest fish is a coral beauty that is only 2 1/2" long. Kinda like Gulliver in Lilliput..lol. The only thing I am worried with the trigger is the fact that I have 3 pencil urchins for algae control. I have read that the pinktail is not as aggresive and tends to leave inverts alone. Is this true?

 

Pink Tail triggers are supposed to be less aggresive and relatively reef safe but each fish is an individual. You probably can forget about keeping any shrimp with it though.

 

Blue-Throat and Niger Triggers also fit that mold IMO!