Thanks all for your input! There is a slight resemblance to a Z-Rock female and also to the Protomelas spilonatus Mozambique although it appears that the Protomelas is somewhat thicker in the body. This one is 3.5-4'' now, I'm keeping my fingers crossed that it's NOT a Protomelas - way too big. If it turns out to be one of those then it will have to find a nice new home! Time will tell.
Good eye! This is an interesting tank. Not a good mix with 4 African, 1 Hap., whatever this one is and the 2 Rams. They have all been raised together (except for adding this one), not one ounce of aggression. Actually the Rams are the toughest and only with each other. There are tons of caves and plants to break the line of sight.
I know that not everyone agrees that this mix can work, and usually it doesn't from what I've read and learned from others. I watch these guys very closely and as they mature I may have to move someone (probably will be the Rams). For now they are small - largest about 5" and for the moment all is well.