Diy rock-what cement?

[Fishward]

thanks Joe... fairly easy to do.. really wanted to mimic a reefwall in a really limited space so i couldn't stack... all you have to do is make sure you cure it underwater for a significant amount of time and once you change the water and you dont see a ph change for a week or so, start on salt water and do the same...

[GreenSpottedPuffer]

Thanks guys.

I am just making a very small amount of rock for the tank so I dont want to buy a huge bag of concrete. I want to try a real lagoon type tank this time with very little LR and a hell of a lot of sand.

It would probably be better to just use LR but I kind of want to make the shapes exactly how I want