They don't seem to be wanting food. They are heated. 22 degrees celsius. I give them mealworms and they just let them rot
22 degrees Celsius is a bit too cool for them to thrive in. They will still grow, but not as much as if they were heated at around 30 degrees Celsius or so. I'd offer a bit more variety as well, considering that they eat pretty much any proteins you give them. Aside from the usual feeder insects, I often opt for fish flakes, bits of almond, chopped sunflower seeds, and crushed chia seeds. They also benefit from sugar water for carbohydrates, so be sure to give them a constant supply.