The Planted Tank Forum - View Single Post - Deep Substrate Bed - Denitrification
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Old 02-13-2013, 04:04 PM   #6
RobMc
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So here is what I was thinking.

Sump with refugium - no filter floss / fine media prior to the fuge section
4-5 inches of fine grain sand (in fuge)
Flow across the top of the water column only - allowing detritus to settle

Flora:
floating plants to remove excess nutrient from water column
Java moss to supply supplemental diet for the fauna
eventually crypts to lower base nutrients in the substrate

Fauna:
Red cherry shrimp or pond snails to eat the dying floaters / java
black worms or tubifex for substrate aeration / breakdown of settling organics.

In this experiment I would like to have a dominant population of red cherry shrimp as I've read that older RCS will eat black worms - however blackworms will most likely out-reproduce RCS if given the chance. It will take a while before detritus starts seeping into the lower levels of sand, so I think a few months with just RCS would do it. Tubifex worms may be a better option as they will stay out of the water column and may burrow deeper into the substrate.
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