diy reef rock

[Wantsomemora Acrapora]

has anyone made there own reef rock with portland cement etc...? I want to do this but not sure if it is reef safe long term. Thanks for any answers.

 

[Spare time]

Dry rock made of Cement?

Pictures says a thousand word. My aquarium fabricator offered me this "rock" made of cement. I am newbie to this, so I just want to seek some advice / opinion if this is okay to put in my future saltwater build. He said the "rock" is cured and made of sand and Portland cement. The design is...

www.reef2reef.com

My only concern would be that it may not be porous (however biomedia can help you out)