I agree with Tallinu, my splitting Ricordea floridas eat, but rarely at the same time. It seems that one will suck the food down while the other just holds it in its mouth. When the first finishes the second sucks it's food down next.
Some rics do not have a well developed feeding response. Just leave the food close by their mouth for 20 minutes or so and they may wrap their mouth around it eventually -- if nothing steals the food from them.