What light and fixture is best for hermit crabs
Many people do not use special lights for their hermit crab's habitat, but lights can be very beneficial, both for providing healthy daylight and for maintaining proper temperature. When choosing lights, pay close attention to wattage. Lights with a high wattage over a small tank will cause the humidity to drop below proper levels as well as raise the temperatures into a dangerous range for your crabs. We recommend the use of a 15 watt bulb for a 10 gallon tank. The bigger the tank, the higher the wattage can be, such as a 60 watt bulb for a 55 gallon tank.
Lights that you can use include fluorescent bulbs that provide UVB and UVA light, incandescent bulbs, nighttime heating lamps, or a combination of these. You should use a timer to make sure that the light cycles are maintained appropriately.