New to freshwater aquascaping

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Hello; I have found a thicker/deeper substrate to favor plants. Four or even more inches deep layer. Also not too fine of a substrate. BB sized as a sort of minimum to small pea sized.
 
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If im wanting to do carpeting plants, what's the downside to doing a finer substrate?
Hello; From personal experience I have tried construction sand simply because i had a pile around. The plants did not do well. I think it was too fine grained and may have compacted too much for the rooted plants. It was however fine for my pair of Kirbensus cichlids. They found it good to dig into.

The other issue with fine grained substrate is the problem with toxins which can accumulate. Seems the sand can form anerobic pockets in which bacteria can thrive and produce toxic byproducts. Reports on this in this forum.

A way around this if you wish to use sand is to DRY SIFT it with a screen. I made such a screen with 2x4's and screen wire. Got rid of the dust and finer sand particles. I could come up with various grain sizes.
 
Hello; From personal experience I have tried construction sand simply because i had a pile around. The plants did not do well. I think it was too fine grained and may have compacted too much for the rooted plants. It was however fine for my pair of Kirbensus cichlids. They found it good to dig into.

The other issue with fine grained substrate is the problem with toxins which can accumulate. Seems the sand can form anerobic pockets in which bacteria can thrive and produce toxic byproducts. Reports on this in this forum.

A way around this if you wish to use sand is to DRY SIFT it with a screen. I made such a screen with 2x4's and screen wire. Got rid of the dust and finer sand particles. I could come up with various grain sizes.
We deal with this in the saltwater side as well, you need to be careful about stirring up the sand. The method i was wanting to use was a layer of gravel to build up the topography I wanted, a layer of pond soil and then a thinner layer of sand to really just keep the soil down.
I could see the main issue with the construction sand being a lack of nutrients if you didnt use root tabs. The sand I planned on capping the whole thing with is for planted tanks- its the fluorite sand but I thought about doing the aqua soil that's those rounder pieces. I just dont like how much it settles into mud after awhile.

This is my saltwater tank
120 gallons

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