Help please

[xpotato]

I would like to know what RSG, (F1) and (F2) stand for?

Does (F1) mean grade A?

Is grade A the best?

How do you determine the discus' grade?

thanks for you help

[daninthesand]

look here.
http://forum.simplydiscus.com//index.php?board=6;action=display;threadid=11000;st art=0