heh. you hit on one of my favs here nowicki. i would love to see this get perfected and take off. however right now it seems there is a lot of variables and some people can't pull it off. DIY rock will spike the pH so you have to cure it in a holding tank or a tank you just started before exposing inhabitants to it.
a lot of thought goes into making it more porous - some people stick straws through the still wet rocks, others blow balloons up in them to make holes and i have heard of some people using bio-balls in them to make them lighter.
garf.org is one of the pioneers in this field. i believe they now mix some plastic shavings in the mix to encourage coraline growth. definitely check their site out.
i say go for it. it might take a few batches to get things to your liking, but who knows, maybe you will figure something out that will become a standard! *
read all you can - do searches for 'diy live rock' or 'aragrocrete.'
here are some links too:
http://www.garf.org/howtodoinformation.htm#Aragocrete http://www.garf.org/MPegs/AragocreteArch.html http://www.athiel.com/lib10/rockmaking.htm http://www.geocities.com/CapeCanaver...ementRock.html
if you do it, keep us posted here ! * :thumbsup1: