the crickets shouldn't need their legs broken for your dragon to catch them. As he is so small, he shouldn't be offered crickets bigger than 1/8" in size. No bigger than the space between the dragon's eyes is the size rule for most insects. Waxworms should only be fed sparingly as they are rather high in fat. Avoid mealworms and superworms at this time too, these shouldn't be fed to dragons till they are at least 10" long head to tail tip, and only occaisonally or in small numbers after that.
Small silkworms are great insect feeders to use, being soft bodied with high levels of water, protein, calcium and other good nutrients. Silkworms are a little higher in fat than crickets but are much more filling, so that difference usually evens out by numbers consumed.
The rock pile you have as a basking spot probably isn't a good ideal. To much risk it can shift and either trap a leg or claws. A good basking spot can be made from the large flat rocks found in petstores, or flat rocks found in the wild (wash well and sterilize in a 1:100 bleach/water solution or baked in an oven for a few hours at 200-250F). Driftwood,cork bark or those coiled bark 'hides' would work as well. Slate slabs can be purchased for a great price at lumber/home hardware stores. These are sold in 12" square sections, usualy about a quarter inch thick and pretty easy to break into sections. What is even better is you probably can get it free, if you ask for already broken pieces. These can be stacked and glued together to form a nice rocky outcrop, sections can be leaned against eachother (add a bit of 5 min. epoxy to sections to keep them stable) to form elevated and sloped basking spots.
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PHLdyPayne