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I'd say that not 'all small things' can be talked about in the same breath. Our closed systems are bacteria based. From there, many background species can be noticed in spring and summer. But note, they are seaosnal and of not much use in the big picture. I posted a thread on NI reading the 'hatches' we see in our ponds in late spring and summer. These can be a food source for koi but really antecdotal in the big picture. And I don't know too many indoor pond hobbyists that are not sooner or later bothered by tiny flies attratced to the filter water for breeding.
But what we are talking about in the filter conversation of truly tiny forms of life, mostly protozoa ( trichodina, ich ect) , nematodes, fungi, trematodes, monogenea, copepods etc.
I made some points earlier that I will make again here-
IF you treat you pond for costia or ich or trichodina with an agent like PP or formalin , these species are gone for the season, or at least severely cut back. This is one reason I hate to treat ponds unless it is obviously necessary.
Secondly, if a pond is maintained well, there is very little in the way of nutrient source for life higher than bacterial/agal/fungal levels. As I mentioned, heterotrophic free bacteria swarmers can reproduce once every twenty minutes. The population of background species really can't competitively compete with that kinda reprductive power.
Thirdly, smooth walled ponds, of excellent turnover and current do not really provide environment for many species ( other than agal 'forests' on the pond wall). Certainly, a clear filter chamber with high turn over and high current is not a likely place to find such species ( most live in mulm rich , leaf covered wild ponds for example). Not to say they are not in your pond! And not to say that they can't be a good productive member of the pond. But to cultivate them as part of crowded biosystem? Not practical and not necessary.
I suspect that the invention of this media design was in response to issues of fines always associated with fluidized bed type systems. By definition, they are dynamic and non trapping. This is a good thing and represents advancement in bioreactor design. But because it is MOVING and NON TRAPPING, there is no real settlement potential. This then, causes fines to be present based on stocking, food type, prefiltration efforts and dwell time in filters. I have an article coming out in one of the koi magazines on dwell time and do not want to go into it until the article comes out next month. But suffice it to say, fines should be dealt with in the ponds overall design. JR
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