Silica sand?

[Travis L. Stevens]

Here are the pictures as promised.

Here it is in scale next to a pen, a highlighter, a "jumbo" paperclip, and a pair of scissors (their called shears on the package )

This is what it looks like on the outside of the rock. (I'm covering the inside)

Here is what the inside looks like when I broke it in half. (I'm covering the outside)

 

[wiggie89]

WOW that is porus, I will deffinatly do that.

 

[Travis L. Stevens]

I think I will put this in the DIY forum. I think my tank has been running with it long enough. Thanks for the unintentional courage

 

[wiggie89]

Your welcome! It is deffenitally somthing people should know about.

 

[Travis L. Stevens]

For those that were following this thread and curious about the rock, you can find more here http://reefcentral.com/forums/showthread.php?s=&threadid=807988