So I found a couple specks resembling mold on my sponges this weekend also.
I tossed all of my sponges right away, drove around looking for a B&M that had some other form of humidification and grabbed these, sounds like I will need to upgrade to beads eventually:
This PhD (portable humidification device) is charged with a unique HYDRO-GEL which will absorb up o 400 times its weight in fluid. This device will achieve maximun moisture output and absorption to regulate humidification perfect. Our propietary anti-fungal/anti mold formula eliminates peaks and valleys in humidity and mantains a precise 70% levels . This 4 oz PhD will humidify 50-100 cigars with zero chance of over-humidification. Regulates Humidity to 70% RH.