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Re-using substrate question

Joined
26 Feb 2013
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3,406
Hi all,

I recently took apart one tank that was running for 2 years planted in inert white sand.
I am placing a soil substrate beneath and re-using the sand.

However, after ripping all the plants out I noticed the sand of course is full of "dirty" brownish particles. They settle very fast as in within a minute the few times I disturbed them and they are small enough to fall between the grains of the sand which is about 0.9mm grain size.

My question is, before re-using the sand should I siphon out all these particles or are they some sort of beneficial stuff that I can re-add to the tank? I don't want to remove everything but then again there's no point adding detritus to a new setup that can cause trouble.

There were not any anaerobic issues in the sand at all when I turned it around, all looked very healthy to me, no smell, despite the "brown" detritus particles and the fact I didn't touch the substrate for such a long time. They brown particles look a lot like filter mulm.
 
I would leave a little mulm in the bottom of the tank to help jumpstart biological activity.
As for the sand, I might pour it into old pillow case and run hose through it to help clean it a little.
 
If it were me I'd take it all out and wash it completely so you're just left with pure sand. There will be plenty of nutrients in the soil, so you don't have to worry on that score. And you'll be able to scape without too much disturbance.
 
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