humidity is usually at 50-60%. When it gets low I just sprinkle some water on the glass. im going to look for a large mouse soon to feed it. i had a feeling the hamster would be too large but thats what owner told me rat medium size. and yes it weighs 263 grams idk if thats small or what. he did say she was slow to eat and has irregular eating schedule. and yeah about the hide, i dont see it in there that often maybe 30% of the time,70% its usually on the side of the tank or on top of it.
for the mouse. i took it out the freezer and put it in really hot water for 15 min while inside a plastic bag.