So as to not start a new thread...
My girls will not eat hay. They might take a bite or two during the day, but they won't eat it.
I've tried to give them less food and more hay, but I haven't been successful in the "hay is good for you!" tries with the girls.
The boys have never had a hay problem.
The girls are probably 8-10 months old. I give them timothy hay. They love their Oxbow Cavy Cuisine pellets, they eat veggies without any problems. I did try the blend of hay I mentioned in the original post, but they didn't go crazy for it or eat much of it at all.
Should I try alfalfa hay? Are there other types of hay I should try them on? Any suggestions?