I've never had them...they sure are pretty.
I shied away for the same reason, I wanted peaceful and I kept reading about them chomping down on small tetras... Didn't seem very nice. I like my neons but I had to get 15 of them and still they didn't come out of the plants until I added the guppies who apparently convinced them they were safe. My glolights are pretty if I could ever see them...they think they are bottom dwellers.
I think my favorite fish are the otos. I started with 3 but I haven't seen more than one at a time in a while so I think I must have lost the other two. (Evidence doesn't last long when you have a ton of tetras and shrimp) I wonder if I didn't have enough algae to support them all. In a tank your size though I bet you could support 3 of them. I have a planted tank and between them and the nerite snail I pretty much never have to clean algae. Love it.