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Old 08-11-2013, 11:33 AM   #11
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It does help but the anaerobic bacteria still need a low O2 zone to grow my thoughts are your are losing that zone with the water flow through the DSB With out the anaerobic bacti the nitrAtes will build until it reaches a point where it feeds on it's self and is very hard to lower. With the holes in the bottom of the baffles your sump is not set up for a DSB.

Most people create their own problems by not following the basics and refusing to stock appropriate to their system. Gregcoyote 2013

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Old 08-11-2013, 02:11 PM   #12
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I would replace the DSB with refugium rubble, that's the media the lower baffles are designed for.

How big are the water changes that you're doing? You said you've changed over 40% of the water but if you're only changing 10% of the water multiple times then you aren't really removing much nitrate from the water at all.

Also, like Ivan said; a thorough cleaning of the rocks is a good option.

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