My GTP is about a year now, she was always in the same cage with the same bark, light, heat and other conditions, but from the beginning of the summer I started seeing small flies in the cage. I got very paranoid and changed all the bark, cleaned whole cage and every glass, but it happened again and again. So is it just because it is summer now? Or it could be a different reason? Can it be bad for her? Can it be caused by Monsoon humidifier? I use ZooMed ReptiBark

Thanks in advance for advice.