I use to do reef tanks. I had a 35 hexagon with power compacts which I kept softies in. Colt coral, mushrooms, various polyps, bubble coral, and one piece of green opened brain. It was a small talk, so I didn't keep many fish; a maroon clown, bicolor blenny, two hawk fish... At one time I had an eel and a lionfish. The lionfish died of ich and I traded the eel in for a really nice peice of live rock. (Darn eel eat everything anyway!)
I kept seahorses too. Common hippocampus and dwarfs. I really enjoyed them; very fun to watch, but HARD to care for.
Currently, I am working on an Amazon
Biotope. So far, I only have six cardinal tetras and two cory cats, but I plan to add in some bleeding hearts and hatchetfish.