What is very important is ventilation. Especially if you have an aquarium or terrarium, it is important that you ensure good ventilation and that it does not get too hot during the stay. You can monitor the temperature in the enclosure by hanging a temperature gauge in the enclosure.
Be careful not to put your hamster in a draft. This can lead to colds. You can recognize a cold in your hamster by sneezing, a runny nose, weight loss and a watery eye. He may also be wheezing or whistling. Colds are caused by drafts, but also by stress, temperature fluctuations in the environment. A cold does not have to be a problem for us humans, but should not be underestimated with a sick hamster. Visit the vet to prevent the disease from developing into pneumonia