cemented rock
 

I have cemented rock together to make towers with portland 10 cement
I was wondering how long I should cure the rock/cement???

I have it in my tank that just has fresh water in it and was gunna do 2 to 3 50% water changes before I was gunna do a hole water change and add salt
Anyone have any opinions ??

how much cement did u use? I know when people make reef plugs they leave it in the toilet tank and let it flush for weeks/month. but those are whole plugs.
test your water. PH should be affected by curing concrete. (I think...)

It was about 50/50 mix with crush coral and only used about 2 4L pails worth of mix

When i make my plugs i get some pretty heavy phosphate leaching may want to keep an eye on that.

+1 on the ph keep checking it and it will let you know when the cement has curred (its gonna be high for a while )

My understanding it that it will take 6 weeks to a few months to cure in fresh water and that's with daily water changes. It's recommended to use a separate container or bathtub other an aquarium for this reason. For small pieces you can place them in a toilet tank for a faster cure rate.

As others have mentioned measuring the PH of the water will tell you when it's cured and give a better idea on the progress.

Will the PH be very low or through the roof

through the roof.

Thanks for the info ill keep my eye on it.and iam not in a big hurry to get it going so when ever its ready its ready then do a hole water change and add salt