i was worried with this wen i first had my two whites. i would always see the larger frog eat but not the smaller. i think the smaller frog was eating but i just wasnt seein it. willow (larger) would jump down off her stump as soon as food was put in then go back wen she was done, thats wen id put a few etxra crickets in for oki (smaller)just to give him the chance to get somethin to eat whilst willow was sittin relaxin after eatin her dinner. even now one is still bigger than the other but i think they may be different sexes. oki will now come down wen its feedin time but they tend to hunt in different parts of the terrarium (and mine is smaller than urs-30x30x45cm) so maybe try spread the crickets about or use two feeding bowls. like don says theres no way to tell wot will happen (its the same with any pets) but hopefully if u get a frog of similar size itll all go well. fingers crossed for u and good luck