I have another question, this one is about excavator clay.. I have some, and I broke it down so I could rebuild it again, but now I'm scared to use it.. its growing this white mold? Or bacteria? I'm not sure what it is, but it freaks me out! I love building stuff for them out of it, and I actually spent alot of money on the stuff, especially to not be able to get any use out of it.. I mean, we are talking a couple hundred bucks on the stuff.. I wish I could just go buy more, but I cant..I tried contacting zoo med, but I guess they are blowing me off cause I haven't heard back since I sent them the pics of it.. any ideas?