I have just found a small cluster of mushrooms at the back of my WTF Herberts tank, they are white have a tall thin stem and closed cups. I have never seen or heard about this before? Is it safe for my frog? I am a fan of a natural habitat for my frog and was concidering getting some real plants however I know nothing about mushrooms. Has anybody had any problems with mushrooms before? Any advice would be great! Thanks