Limestone?

[KCD1803]

Any down side to using lime stone? I want to make some ledges and cannot find good lace or coral to accomplish this task, thanks !

 

[Sk8r]

Limestone is old coral. Be sure to condition it by a long soak in salt water, or you may have ledges with lots of green algae. You can cure it with GFO, but doing it in your tank may have some algae problems.

 

[RocketEngineer]

BRS has a bunch of different shapes for sale as dry rock.

http://www.bulkreefsupply.com/bulk-dry-live-rock-live-sand/bulk-dry-live-rock.html

 

[Timfish]

Been using local limestone for decades and never had a problem with it. It's usually easy to drill with a diamond bit, locally sometimes pieces may have a large amount of what looks like quartz crystal but it's only a small percentage. Here's a video done by one of the local reef club members: https://www.youtube.com/watch?v=nRjHGhs-aaY
I also just hose it off good and use it as is, here's a video of a 500 gallon I set up with roughly 200 lbs of limestone: http://youtu.be/_Uf5IyXvajg