I'm reading that a could uv bulb is sufficient and good enough. Thor is aprox 5-6 months old and I'm wondering if its possible that the coil was ok at first but no longer? His eating habits have changed dramatically in the last 2 weeks. Went from eating 20 crickets or 7 worms to maybe 2 every other day and just salads twice a day. He does seem less active as well. Can someone send me a name of what bulb and fixture to get? Does Amazon sell them?