I dont understand why it is always thought to be bad. most wild snakes lives with it every day and if you have a bioactive setup it is what your springs eat. It is the mold that breaks down most waist. In my frog tanks i love to see the range of molds and such my fave is slime molds. Anyway whats the big deal with molds and fungi?
not a pic from my tank but cool slime mold grows on the glass some times but dosnt last long.