Looking for suggestions to brighten up my tank so it looks like a reef

[isaac1]

Hi I'm wanting to brighten up my tank I have a couple corals but aside from them it looks pretty bland, 1 brain coral,2heads of frog spawn,a hammer coral and 2 chromis I want to add more things to covet up the rocks but I'm not sure what to put because I don't want conflict in my tank? 25 gallon reef