The Planted Tank Forum - View Single Post - diagonal sump mattenfilter?
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Old 01-19-2013, 06:05 PM   #5
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Doing it diagonal seems fine to me as long as the flow rate is within the proper range as mentioned. And to prevent the water from channeling under the mat, you could definitely put substrate in the sump. I see people with substrate in sumps all the time. I would use large size pea gravel or something like it, it would help with filtration, even in the event of the water channeling under the mat.

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