What to add next to my 45g?

[justdun]

Hi all, I was just looking for some thoughts and opinions on my stocking. I have a 45 gallon that's been set up for 5-6 months. I do about a 15% water change every week and haven't had any issues in this tank besides some hair algae. I'm getting ready to possibly add a new fish soon and I just want to make sure that my tank won't be overstocked and that everyone will get along. Currently my tank has:
- 2 ocellaris clownfish
- 1 citron clown goby
- 1 Mccosker's wrasse
- 1 BTA
- 1 skunk cleaner shrimp
- 1 fire shrimp
- 1 fighting conch
- 1 long spine urchin
- various snails (need more)
- easy corals: pom pom xenia, GSP, and ricordea

Some of the fish I've been considering (picking a few from the list, not getting all)
- tail spot blenny
- helfrichi fire fish or a pair of blue gudgeon gobies or bar gobies
- royal gramma or orchid dottyback
- goby/pistol shrimp pair (definitely want to do this, just can't decide on what goby I want haha)
- I wanted a yellow coris wrasse, but unfortunately I think my sand is too rough. I have black CaribSea
- Flameback or cherub angel. However, most of what I've seen says minimum of 55 gallons is best

Open to suggestions!

 

[blaxsun]

Everything except the dwarf angel and yellow coris wrasse are ok. 45 gallons is too small for an angelfish and the black CaribSea sand isn't fine enough for wrasses.