What is '60W moon UVB' exactly (link to product)?
What are warm side and cool side temps, and how do you measure them? Is the warm side temp thermostatically controlled?
Please post photos of the enclosure, and of the furnishings, and of the gecko.
Have you offered any other types of feeders?
What "calcium supplement" exactly (brand and product)? Not relevant to current issue, but definitely relevant to ongoing care.