I don't know what is growing on my sand! The sand is turning like a yellowish amber color in many places. I have 3 hermits who won't hardly touch the sand, a brittle star which does the same thing. I just added 6 nassarius snails because I thought they will help. Will they? Is there an animal which will scower the surface and eat this ****, whatever it is? I'm afraid this is bad and I need to fix it FAST!! Also are my hermits going to attack the nassarius for their shell? The nassarius are way to small for the hermits now. Please help asap!!!