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water flows over and under dsb and is pumped back to display
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How are you able to keep the substrate suspended can't be egg crate alone right ? I don't think you'd develop an anaerobic zone with the water flowing under the DSB, do you have a pic of exactly how this is setup ? I'm having a difficult time understanding exactly what you did.
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there are filter feeders and sponges doing quite well
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This is a good thing it'll help remove dissolved organics but using a filter sock will not be beneficial long term for these filter feeders since the socks trap everything. I use a filter sock 24/7 and all the pods, mysid shrimp, snails, bristle worms etc. get trapped in there.