Raising crystal wyvern?

Me and a buddy have a decent base and good tames going. Next step is wyverns. Got a couple of high level bld crystal wyvern eggs and a couple ice wyvern eggs. We'll get the milk for the ice, but from what I understand the crystal wyverns will only eat primal crystal. We're on valguero, so how do we go about getting it? Tried the daeodon method with a low lol poison and we just can't stay online long enough to make it work. Any tips or suggestions? Any help is appreciated!