Brick under dirt? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 08-30-2015, 09:12 PM Thread Starter
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Brick under dirt?

I want to create slope with dirt/sand cap but 4-5" of dirt is a problem so I'm thinking of putting some bricks underneath to avoid anaerobic pockets. I've read about people using bricks underneath Aquasoil and other substrate, but not dirt.
Any thoughts?
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post #2 of 5 (permalink) Old 08-30-2015, 10:45 PM
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Why brick? Is it because you have it already, and can easily smash? I've heard of using small pieces of lava rock too.

My only concern with brick is the relative density, but I suppose if you can get irregular pieces it might work. Just don't use huge pieces resting right against the glass bottom.

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post #3 of 5 (permalink) Old 08-31-2015, 12:26 AM Thread Starter
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I mean to put the whole brick on the bottom glass, if it's too much pressure for glass pane, would some sand underneath help? One reason I wouldn't wanna use lava rocks is because dirt will get around open areas inbetween the pieces and settle on the bottom anyway, which defeats the purpose of preventing anaerobic pockets.
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post #4 of 5 (permalink) Old 08-31-2015, 01:04 AM
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It's ok for the soil to get between the larger pieces, the point is not to have any particular spot packed deep with soil. The irregular surface of the filler provides that spacing. The filler (eg lava rock pieces) basically breaks up the packing so to speak.

You actually want those irregularities/granularities to prevent anaerobic pockets. Hence the use of ADA Power Sand. This stuff actually looks like horticultural pumice which is just expanded lava rock. Making it lighter weight and more airy.

If you have the budget, check out ADA Power Sand. Cheaper alternative is horticultural pumice (at least ten times cheaper). If you can screen it, use the biggest pieces from the bag.

I've read of some people using styrofoam or sponges under big rocks when hardscaping. This could work for your brick idea, but need to be careful that there isn't any sand or gravel that gets trapped under the sponge/foam which then puts undue pressure in one small spot.

There's also other folks out there who have done deep beds, but poke their substrate regularly to release trapped gasses.

I'm sure someone else can chime in on this!

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post #5 of 5 (permalink) Old 08-31-2015, 01:17 AM
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Search the forum for hills and pantyhose. Quite a few people are attempting to build hills with more or less success.
The problem is not really to make the hill, it's to make it to stay.


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