they all grow at their own rate. just keep feeding at regular intervals with appropriate sized meals. as for the heat and humidity.... make sure you are giving it time to level out before drilling more holes. sometimes it takes a few hours to a day for humidity to level out. but yes if the humidity is way to high then you will want to add more ventilation. but by doing so you will affect your temps. you have to find a balance. 75% humidity isnt that far off from where it should be. maybe try moving the water dish further away from the heat source if it isnt already. good luck and enjoy watching him grow
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