I have an ORA electric neon dottyback. Specifically cross bread to ease the aggressive behavior of dottybacks. I can honestly say he/she is the most docile fish in my tank. Even the cleaner shrimp scares him back to his hole.
Look for a Chrysiptera Springeri, or Sapphire Damsel. Keep looking until you find one that's all blue, no black lines. Awesome blue color, don't get too big and aren't known to be very aggressive. Mine is a pussycat in a 29g biocube with a clown pair for tank mates.
Looks good. How many pounds did you get from TBS?
Leave the rock but you need a little more balance on the right side. Nice tank
Before you get any fish...might want to do some crabbing in your tank to get any unwanted hitchhiker crabs out. I picked up an order of rock from Rich about 3 weeks ago and love it, but you need to remove any rock and/or gorilla crabs that may be lurking in the rock. They can and most probably will make a meal of a fish while it sleeps in the rock at night.
Nice aquascape!
If I could criticise at all it would be to move the tree thing just over 1/3rd the way in from the left (can't remember what they are called) to where the second from right island is and move that island either backward or forward from there. But that's picky.
I used the baited cup method to catch a few of them but my most productive method is to isolate the rock the crab is in, remove it from the tank and put in a tub of tank water (water change time is perfect for this). Use a powerhead with attached tubing and use it to physically flush the crab from its hiding spot. Already got a rock and gorilla crab out this way.