Blue chromis are great , lively , and good in groups I have 3 in my tank.
I also have a Flame angle who is fantastic , I have a few mushrooms , a Zoa frag , hammer coral( fantastic ) and sun coral and he hasn't nipped at any what so ever .
But you will need more LR
for ur DT and believe me no matter how much u like it now more rock will make it look better , I have a 55g tank with 60lb of rock and considering more .
You may also want to start considering CUC like a few hermits and snails.
I'm done now 0_o.