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Old 06-13-2010, 07:09 PM   #1
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Exclamation DIY rock with VIDEO tutorial and Q/A




-1 Part Aragonite sand (picked up at most fish stores can be substituted for pool sand or removed from the formula all together... I like to keep it in there)
-1 part White Portland Cement type 10 or general use (can be picked up at some places where cement supplies can be purchased. You can use the gray stuff as it is cheaper and easier to find, but I have heard that it takes longer to cure and it doesn't look as good IMO, also to make your rock stronger you can add extra cement to your mix... makes it slightly less porous and slightly heavier... would also make more anaerobic areas)
- 1 part Course Rock Salt. (I used water softening salt it can be purchased at some grocery stores as well as at some appliance stores and some hardware stores... also very cheap... can be removed from formula to make rock stronger... also makes it less porous and heavier... also makes slightly more anaerobic areas)

If you would like to see more pictures of the rock or see it in an operating system (operating as of September 2010) take a look at my build thread.
320g build/journey/experiment :-)
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Old 06-14-2010, 03:14 AM   #2
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Very good video. Keep up the good work. You have any more good ideas?
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Old 06-15-2010, 12:53 AM   #3
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If you are making more elaborate shapes and/or you want it to flake less you could do 1.2-1.5 parts cement and it is still quite porous and not too heavy. The formula I posted is the minimum amount of cement you would want... in the video I was saying that "you don't need to be exact" but if you put heaping scoops of the oyster shell and sand with shallow scoops of the cement your rock will be weak.
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Old 06-13-2011, 06:56 PM   #4
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Great video! A+

Where can you buy the big bag of salt and oyster shells?
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Old 06-13-2011, 11:48 PM   #5
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The oyster shell is from a feed store. (it's used for chickens for calcium for their shells)
Salt is water softening salt. (you can get it from wal-mart in some places or where you would buy a water softener like home depot)
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Old 06-14-2011, 12:41 AM   #6
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Quote:
Originally Posted by Greenmaster
The oyster shell is from a feed store. (it's used for chickens for calcium for their shells)
Salt is water softening salt. (you can get it from wal-mart in some places or where you would buy a water softener like home depot)
I got everything that I need Did you rinse the your mold as well before using it?
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Old 06-14-2011, 02:30 AM   #7
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Yes but you don't need too. Looks great man.
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Old 06-14-2011, 02:40 AM   #8
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Quote:
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Yes but you don't need too. Looks great man.
I didn't rinse the mold. Thanks for the help!
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Old 06-15-2011, 03:26 PM   #9
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After 48 hours of curing, you take it out of the mold and then what's next? Let it air dry for 24hours or straight to soaking? Thanks.
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Old 06-16-2011, 02:03 AM   #10
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I like to let it get bone dry to ensure that everything is set. Then I soak it.
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