I too got one from Rapps-they must be pretty tough fish cause he gave me it for free and said it would do well with the Amarillo, Trimac, and Dovii that I ordered.
In my opinion the one I have has a temperment similar to a Red Devil and I really don't think they stay as small as 8 or even 10 inches-got my on March at around 2 inches and has already doubled in size.