That looks like a really deep dish. I was using nice clear glass, deep ash trays but my girls must be a bit thick cause they didn't figure out to go up over the edge of the dish. Usually they go at the worms from the side, banging their noses on the glass....I can see the frustration in their faces too, as they continue to hit the glass trying so hard to get the worms. Even now with more shallow dishes i still find a few of them haven't figured it out....they still go at it from the side, only going over and getting the worms after their nose is sore i'm sure LOL In the mean time the worms escape the dishes. Its rather frustrating for me LOL.
Flame and Karma two of my new girls only seem to be interested in supers or really huge butterworms. They don't even notice the mealworms. Flame will come out and take them from my hand if i don't get them in the dish quick enough...its cool actually. but if i try the same with mealies she hides. I love these geckos.....hehehe
Red 
>>I forgot I had this picture laying around, I found it when responding to Red. This shows the type of dish I use for supers:
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>>>>AHHH I suck again. I need something to hold my supers in any suggestions?
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Crested Gecko Zeek:1.0, Ziggy and Zeus
LEOS: Boo: 1.0 normal , Bronx & Nala: 1.1 blizzard,
Lily: 0.1 patternless, Abby: 0.1 albino, Zoe: 0.1 reduced pattern, Dot: 0.1 hypo
New Girls: Flame, Karma, Bubbles and Bell pics coming soon
Chip: 1.0 papillion (small dog)