Trying to maintain humidity for a BRB. Using a 15 gallon tank. Originally had ecoearth substrate, few pieces of cork bark(?), and all but 1/8inch of the screen covered with tin foil. Humidity was dropping between 70-60%. Put sphagnum moss on top of everything and humidity held around 85% but the bark started to grow mold I believe. Cleaned the tank out and sanitized. New eco earth put in, did not put the bark back in, put sphagnum moss over the substrate, added a larger waterbowl over the edge of undertank heater and covered all but an inch of the screen(long) with several layers of cling wrap. Humidity is inconsistent from 80-60%. Moss appears to dry out overnight. 1: Does ecoearth pull moisture out of the moss? 2: Any suggestions?