Is your hydrometer under a heat lamp? If it is, it could give false readings since the heat lamp tends to dry up the substrate. It's best to have thermometers and hydrometers thoughout the tank for accurate readings. I'd cover the top with cardboard and plastic wrap 75% so that it doesnt block the bulb light. Placing the water dish under the heat source also will increase humidity, and I'd switch to an infrared, moonlight, or CHE bulb since the day light isn't necessary unless the room is dark in the day or you live in an area with really short day periods. What size of tank is he in?
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