Hello, I'm new to hissers I have 3 males... I've had them for aboit a month and I'm having issues with mold in their cage.. I'm unsure of what to change the bedding to.. i have a wood mulch in there now (given to me by the pet store) also I'm unsure of how moist to keep their cage! Also I've heard of people putting mites in the cage I do not have those.. do I really need them? Any suggestions are greatly appreciated!