Humidity might be a tad high. I haven't drilled the glass yet but it is not full inclosed due to the thick pump wire coming out of the corner which gives it some air flow and lets humidity out. Maybe the condensation on the glass makes it hard for them to stick? The tank hasn't grown in enough for leaves to be overhanging the water so glass is her only option at the moment. If she keeps breeding like this, I am probably going to remove her. I don't want her to pass from over breeding and I am not purposely doing anything to create breeding conditions in there.