Stocking help for 150 gallons

[Eleni18]

Hello. I have recently upgraded to a 150 gallon mixed reef tank from a 60 gallon one. I currently have the following fish:
2 clownfish (paired)
1 yellow tang
1 blue hippo tang
2 black and white damsels
1 valentini puffer
1 pyjama cardinal
1 mandarin
1 long finned sand sifting goby
1 royal gramma

I am thinking of getting another mandarin, a male one, as the one I have is female. A midas blenny and maybe a yellow watchman blenny. A firefish and much later maybe a blue star leopard wrasse.
Would this be OK? Any other suggestions for colorful, peaceful, coral safe fish with interesting personalities?

 

[Eleni18]

Also, I am a bit concerned about keeping two mandarins in the same tank...Male and female but not paired obviously. Would they pair in the tank? Is there enough food for both?

 

[Eleni18]

The mandarin I already have is a female, so adding a male would be OK? Has any one had this experience? I am very fond of her and would not want her to be harmed