Hi I'm brand new to this forum, so my appologies if this has already been covered in previous posts. I have a small backyard pond in which I house a few map turtles and such. The problem I am having is that the prefilter on the pump gets so quickly clogged up with pond muck (kind of a thick blackish green mud) that the pump stops working within the same day as I unclog them. Would it help if I were to install a skimmer, or do my problems run deeper than that? Any advice would be greatly appreciated.