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So today I was admiring the hornwort that had established itself in a tangle of yuck at the bottom of my pond. That is a long sentence, but true. The sun rays lit it up, and I love to see the delicate fern-like plant thriving. Usually if I see a tangle of yuck (string algae + mulm: the sludge that collects at the bottom of an aquarium, consisting of fish excrement, decaying plant matter, and other assorted dreck) I can take a stick and twirl it around and remove it....but I didn't want to disturb the hornwort. I really like seeing plants establishing themselves on the bottom of my pond, it seems more natural. So what do you think Kokonuts? Should I vacuum up the debris at the bottom of the pond (dragonfly nymphs and all?) or go au naturel? I ask because it seems my water is not as clear as it used to be. · I use Pond Perfect as a sludge reducer at least once a month · I use a UV light for the single-celled algae. Sometimes I turn the UV light off for a few weeks. · I don't have a surface skimmer. · I change the mechanical filter often (once a month?) · I deep clean the Bio Canister once a quarter (while still retaining the beneficial bacteria!) I haven't vacuumed the pond bottom in a LONG time, perhaps 10 months. There are overhead trees that drop leaves into the pond. I feed gel food that can disinegrate. Do you think not vacuuming the bottom is the difference between last year's sparkling clear water and today's particulate-water?