I'm afraid that's not correct Shawn. The Fx designation stands for filial generation, which is literally "the first generation descended from". Though this terminology can denote any linage, it’s typically regarded as the generation descended from wild. Thus F1 fry had wild parents, and so forth.
A cross of a wild fish (F0) and a F1 fish (first generation tank raised) would properly be considered F2.
Incidentally, F0 is a misnomer. The term has no scientific merit. The way I’ve heard it, an exporter started using it on his stock lists to denote wild fish and it ended up sticking. I’d avoid it and just call them wild.