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That was a lot of replies. Basically we have to bring in the zonal aspects of the filtration system. If you want to target POM particulate matter you need a stronger flow to suspend the larger particles. These are bigger than dissolved organics or bacteria. You will have a lot of feather dusters develop in there. There are sponges better suited for that zone, but the cryptic cave sponges prefer weak currents and only tolerate very fine sized particulates. That cryptic zone is where cave sponges can thrive. So a true cryptic zone could be after skimmer and a filter feeder zone (semi cryptic or semi exposed) before skimmer. Assuming you are overflowing with no micron bag. If you run overflow threw a micron bag, you could put cryptic zone in front of skimmer.
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