Last week when I first posted I had aquired two ducks, now I have been convinced to adopt the last two. I have a self filling and draining pool set up....however, with all the rain we have had....and the extra bills rooting around near the pool it is getting very muddy. I was thinking of throwing down some sand....is this a good idea or bad? Any other thoughts. They definitely love the pool.....they are very cute actually taking turns since they all can not fit in at once.