German Blue rams or Kribensis

From what I've heard from others, Blue Rams are excellent parents. They may need to get the hang of things if they are young though. So the first batch or two may not work out, but after they get the swing of things I hear they are excellent. I have no experience with the other type you listed.
 
If you get a random boy and girl it doesn't necessarily mean they'll breed. I got lucky this last time. But I've tried before and they kill eachother. Granted it was a small tank (12 gal) but still, just because you put a boy and a girl fish together doesn't mean they'll like eachother...except for maybe guppies. :)

May I ask why you want to breed them so badly? Is the tank even set up yet? Rams are sensitive to new water...well, all fish are. The tank should be well cycled meaning at least a month running before you add them. I've only taken care of kribs when I worked at the LFS years ago...they seem slightly more hardy as a general rule, but they also get bigger than rams so you'll need more space.
 
Well im getting a tank in 12 hours and am going to put aside 2 biggest GBR male/female, i'm not badly wanting to breed them, just can't make up my mind. And of course i will have to w8 about 4-5 weeks for cycle to be completely under control. Then i'll add the GBR.
And i'm completely ditching U.G.Filter thanks to this Thread posty thingo
 
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