Instead of potentially wasting $8, have you tried mixing in a worm like a wax worm or something sweet like butternut squash, banana(not very often though), or some other fruit? I've found that they will usually either accidentally eat the salad when trying to eat the worm or the beardy eats the salad because he/she notices the presence of a treat inside the salad. This method doesn't always work but is worth a shot before buying that dressing.