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Sand under controsoil


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What's the reason to add sand?

 

you can just do thin layer of Contro soil. 

+1.  you can also use small lava rocks as a substitute for the sand since its much more course and provides more beneficial bacteria. I've used lava rocks to create higher aquascaping.  Sand as the underlayer wont be beneficial  since its so dense .  unless the sand you're referring to is large like pebbles and is inert.

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I would definitely recommend lava rocks of some sort as many have recommended. Sand is very dense and compact and lava rocks allow bacteria and micro organisms to colonize much easier, overall for a much healthier substrate. Look forward to seeing your show tank.

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In shrimp tank, shrimp would eventually level the substrate.

 

Please keep this in mind.

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