lava rock gravel/sand? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 06-04-2009, 08:16 PM Thread Starter
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lava rock gravel/sand?

What do you guys think of this as a good plant substrate
http://firerocks.biz/black-lava-rock.html

look at the 3/8 minus inch grain. The price looks right but not sure how big is their box.. I'll have to email them.

My only concern is it might be sharp for bottom dwellers.

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post #2 of 4 (permalink) Old 06-04-2009, 08:45 PM
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if you were to get the very black that that they state is volcanic glass it would be razor sharp. you can actual make knives out of obsidian (volcanic glass)

as for he black to green variety it could range from sharp to just plane rough edges

GEOLOGY Rocks Have A Gneiss Day
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post #3 of 4 (permalink) Old 06-04-2009, 09:02 PM Thread Starter
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looks like it's just crushed lava rocks. Yeah, I've seen obsidian knives/arrow heads, pretty neat.

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post #4 of 4 (permalink) Old 06-05-2009, 03:31 AM
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if they are crushing the basalt it will be very rough just like most crushed rocks.

GEOLOGY Rocks Have A Gneiss Day
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