Add more "dead" rock to existing system

[govolsguy31]

If I add some additional rock that's dead/ dry and has been acid washed, will I see a spike of any kind to my existing system? Was hoping to cure some rock for a while for a buddy in my sump to use in his system in the spring.

 

[tankstudy]

If the rock has been cleaned of any organics, you shouldn't see a spike of any kind.

 

[bif24701]

Acid washing does a good job of cleaning the rock. You should be safe. How much is in there currently and how much are you adding?

 

[govolsguy31]

Acid washing does a good job of cleaning the rock. You should be safe. How much is in there currently and how much are you adding?

70 lbs live in there now. 25 or 30 to be added.

 

[BlueCursor]

I have added dry rock to my system a couple times (15% increase in rock). I saw a diatom outbreak on the new rocks, a little on the old rocks but nothing to cause issues. I have never seen parameter swings.

 

[Brad Bessett]

I wouldn't add it all at once. If you can, add half now and watch your parameters, then add the other half about a week or two later.

 

[Techie_]

If it's cleaned well, there shouldn't be any issues. The only thing I can think of would be phosphates leeching out of the rock.

 

[PatW]

Acid washin should remove most stuff: phosphates and organics. If you have space and time, you could always toss it into a container with salt water for a few weeks. Make sure the container is food safe so it does not leach any harmful chemicals.