Nice pics!!! How big is your tank? If it's small, maybe a Royal Gramma (I love mine) or a Bangaii Cardinal, Blue Green Chromis. That's all I can think of at the top of my head. Oh, maybe a Flame Angel. Again, not sure how big your tank is, so it's hard to know what to suggest. Do you have a full tank shot?
Edit: Never mind, topic of post is 20H. I think what I suggested above would do fine (not all together, but at least one or two).