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Insane reefer has stated earlier that some rocks made with salt may fail. I am sorry to say that I am experiencing some of this now. These rocks have been in my aquarium about 6 months now. They are not crumbling, but splitting down the middle.
I’m going to list the various methods I used to reduce the pH so that if someone else ends up with this problem and used similar techniques then we can figure out the variable that is causing the splitting.
One piece was attached to a piece of live rock to make it level and therefore it has a small amount of weight on it. It is splitting down the middle in two different areas.
The other rock is simply a round piece with no other rocks or weight on it. It’s splitting long ways.
In curing these I boiled them and or added 10% vinegar to the solution to reduce pH.
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