Yeah, stuff like this is highly prone to mold growth. Trichoderma, being probably your biggest culprit, loves things like brown rice flour, rye flour, etc., and a nice humid environment. The problem too with trichoderma is that it sends out so many dang spores, as soon as you open a container, you've sent those spores airborne and you'll find your other cultures contaminated quickly. Trichoderma is already everywhere, so there's not much you can do. Eventually, cultures will contaminate out unless they're being kept in a clean room.