Originally Posted by dylan p
Yes this rock will be made with a mixture of cement aragonite and crushed oyster shell and will be seeded by my live rock out of the aquarium I'm currently using. And with some additional pieces I might buy. It doesn't look like natural live rock but once it's covered in coralline algae and coral I don't think it will be noticeable. Does anyone have any experience with this though will it eventually fall apart or does it stay put pretty well
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The only issue with making your own rock is that it will probably be more dense and not as open and porous as natural coral rock is.
The number, size and depth of the little pores and micro fissures in live rock is the most important feature to look for as that is what affords it good filtration capabilities.
Good rock for use as "live rock" should feel relatively light for its size which may indicate that it has lots of space internally for bacterial colonization.
Something with the porosity of lava rock would be perfect.
I fear that homemade rock would only have superficial pores and not afford near the total surface area that natural rock does.
The upside is you can cast it into whatever shape or structure you want, obviously.