Help Identifying Dry Rock

[Ashish Patel]

Can anyone tell identify the large white rock on the Left?

One of my family friends gave me the rock for my tank 4 years ago. I made sure I saved it for a future build and let it sit on the front landscape for 4 years. I believe it is Pukani but really not 100% sure. The rock on the right Reef saver rock picked for the fact that it won't give me algae problems.

I am hoping all the die of has happened while being outside for so long.

 

[Diesel]

By curing all your rock you minimize the risk of leaching phosphate from die off .

 

[Flippers4pups]

I would acid bath all of it to be safe, especially the older rock.

 

[DaltoniousMax]

IMO, it looks very similar to a few pieces of pukani I just purchased.

 

[Ashish Patel]

This rock does not have any visible die off and its open from the back. I have about 6 weeks before my tank arrives so I may aswell cycle /cure the rock in a barrel - Now that ya'll have scared me a bit =)