Choosing a fish or too many?

[Basile]

Six foot tank, 150 gallon tank with a 75 gallon display refugiumto help filtration and grow my own macroalgae. Reef tank 6'x24"x21"tall octopus skimmer rated for 300 g tank. So i want to add another fish. But do i have too much already;






As you can see i purposely made sure i didn't pack my tank with corals so i keep lots of swimming room for my fish, and i don't intend to have a huge collection of corals either i want minimum headakes with feeding and dosing, i want this hobby to be relaxing for me and the fish lol. Most corals will be softies and LPS. i already have a bit of Ulva growing in the reef thats cool for my tang, thats the fish i was hopping to add as well.


The refugium



I have presently;

1 Yellow Tang
1 Magnificent Foxface
6 chromis
1 blenny
1 manderin
2 picasso clowns

Now i was thinking another tang maybe , a hardy one, no blue or hyppo, lol. Maybe a Kole tang , not too big, any other suggestions.