Scum runs away means its natural not man made the skimmer isn't a must. but its apparent the filter might be over worked. for that sized pond i'd treat it more like a n aquarium with water changes and vacuumingWe have a net that we use every day to clear the leaves and debris from the surface, but I will buy a skimmer as suggested, thank you. I will then do a 50% water change and add a few more plants. If I dip my finger into the scum, it runs away very quickly.
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