Hi Travie
It seems that, IMO the German Blue Rams get a long with all fish! Ive had mine with many fish and it never bothers them. From Angel fish to Discus fish, rainbows, rasboras, etc....
What fish do you have that you are thinking of mixing the GBRs with?
that may be easier to figure out if they are compatible or not?

~ kate
EDIT: I just checked your aquarium info. I have mine with gourami and had it with zebra danio's as well. So I would think you are ok to go...
Just not sure if the 29g may be too small for all those fish to get along peacefully, the bigger the tank, more area to spread out in...