can any one shed light on why my two white worm cultures have a dust like covering over the peat and very small white worm in size and quantity. I am feeding on porridge oats and keep the peat moist. They are kept in the bottom shelf of my tank cabinet under normal room temps. any advice welcome as to what I need to do to grow the culture on with larger worms and quantity. Was feeding from both cultures upto March since then things going down hill. Cheers Arf.