Any room in my tank?

[Zerc]

I have a 75 gallon tank with a 55 gallon sump (sump is 3/4 full).

My current stock is:
Maroon Clown
Black Clown x2
Firefish
Flame Angel
Purple Tang.

As for how much liverock I have, my best guess is 150 lbs, but here is pics of my smp with the LR in it, and a pic of my tank when I set it up with the LR in it.

Skimmer is an SRO 1000.

So my question is... I want to add a yellow watchman goby. Will it be ok?

 

[ReefGeeker]

I say go for it.