Why should i cap with sand? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 11-03-2015, 05:40 PM Thread Starter
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Why should i cap with sand?

https://www.plantedtank.net/forums/12...eed-ideas.html

i got a 6g bucket of small black lava rock and a 15lb bag of Flourite Red... im planning on doing my layout with all lava rock and 2" of the Red on top.. thats it...
do i need to cap it with sand?
do i need a layer between the lava rock and Flourite?
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post #2 of 7 (permalink) Old 11-03-2015, 06:07 PM
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Sand will sift down, don't add it on top and expect it to stay there for long.

According to the calculator on this site, see articles under resources on top bar, you only need 13 pounds of Flourite for a 2" layer in your tank anyway. I'd stick to that and forget the lava rock which will also mix. I wouldn't like that color combo, maybe it looks nicer than it sounds?

This is for your interesting 33" long by 22" tall by 6" deep tank, right?


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post #3 of 7 (permalink) Old 11-03-2015, 06:19 PM Thread Starter
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Quote:
Originally Posted by Kathyy View Post
Sand will sift down, don't add it on top and expect it to stay there for long.

According to the calculator on this site, see articles under resources on top bar, you only need 13 pounds of Flourite for a 2" layer in your tank anyway. I'd stick to that and forget the lava rock which will also mix. I wouldn't like that color combo, maybe it looks nicer than it sounds?

This is for your interesting 33" long by 22" tall by 6" deep tank, right?
yes this is for that tank... my problem is on either side of the tank i want about a 8-10" elevation in substrate to make a "valley" effect.. and i do not want to be spending that much on Flourite as its 30$ for a 15lb bag (2" layer according to that calculator)
would any other filler be a better option then lava rock?

ill also be using plastic corrugated strips to reinforce the slope
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post #4 of 7 (permalink) Old 11-03-2015, 06:26 PM
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Sand is used for cost/ease of access to type of reasons. And actually in a Walstad tank
it's suggested to use something a bit more coarse to allow flow of water to the bottom layer better than sand would. Common Pea gravel I'd think will be too large, but is used
by some on here.
I have no dirt sub so I can't give an experienced answer, but I do have Fluorite in one
of my tanks over some fine gravel used as a filler. I like/prefer planting in this tank as
compared to the other one which has Eco in it.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #5 of 7 (permalink) Old 11-03-2015, 06:31 PM
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Maybe what you ought to do is put the lava rock down and use sand to help hold it in place by filling the voids with sand.
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post #6 of 7 (permalink) Old 11-03-2015, 09:10 PM Thread Starter
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So I got some random small gravel from a city material yard for free and a bucket of black lava rock for 6$ i can't seem to find black diamond sand in my city ...Any other cheap sand options preferably black ?
Should I use the free small gravel mixed with lava rock?
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post #7 of 7 (permalink) Old 11-03-2015, 10:35 PM Thread Starter
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The bucket of free small rock chips ... Should I mix with the lava rock so my substrate doesn't seep through or should I chuck it n use sand to mix ?
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