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When I ifirst set up my remote deep sand bed (RDSB) I waited for about four weeks and got a reading of about 5 for my nitrates. Then two weeks later it was back up to 20 and has stayed there ever since. That baffles me. Now I have seen a few people report that they took sand beds out of their sumps and that helped. I don't have any sand or crushed coral in there, but I do have a rather large amount of dirt in there that comes off the live rock. Seeing as my sump is on the ground, siphoning is almost impossible so I will use my canister filter to suck up the dirt. I hope that makes a difference.
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