I had a pair, one jumped out and his/her partner was alone for about 4 months until last night. As soon as I put another in the tank he/she went right up to it and they are instant buds...
Sorry, But I haven't an idea what type it is, my husband bought me the whole 120G setup for my birthday, and it came along with everything else. I had to place it in my 55 when we got all of the stuff home, and it seems to want to attach to the sand..so I guess that is where it stays.......hopefully someone on this board can ID it for the both of us.
This is a picture of a five year old female perc without her significant other..I do have some video footage of her and her boyfriend defending their nest if anyone wants to host it.