The last two 5 lb bags of Critter Clay I bought got moldy within a month of opening and grew reddish colored mold. I am a weekend taxidermist for many years, so I have used the same bag for more than a year in past with no problems. After the first I bought went bad, I bought another now I opened it two weeks ago and it is doing same thing. Put bacteriacide inside and still growing?? Is it me or is it them?