Im having trouble keeping it humid in my 40 gal tank. I have moist sand, sponges in both of my pools, and a really big sponge (about as big around as a CD) in its own bowl, and its still around 60. Ive been spraying it with warm water, but Ive gatta go to school next week, and I wont be here all day to spray it down. Im going to petsmary this weekend, and thats the last time my mom is going to take me somewhere to get my crabs stuff for a long time (shes been running all over with me for those crabs, and now shes getting sick of it). If theres anything I can do, I need to know by this weekend. Please help!!