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Hi just wondering about adding rocks that i have recently seen.
They are slate rocks which i know that they are in the same family as limestone wondering if they would have the same affect as limestone that when added to a tank they to raise the ph and to also buffer the water.

All answers are appreciated.
 

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No, slate is inert. But limestone is not a huge help with your buffer, so if you like the slate, get it!

The problem is with 50% weekly water changes that are good fishkeeping with Rift lake cichlids, the minerals can't dissolve fast enough to make a big difference.
 
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