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Postby Angiewest » Mon Aug 11, 2014 1:14 pm

I have a lovely piece of limestone but not sure if I can put it in the tank as I know its a soft rock and would it affect the ph ?????
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Re: limestone

Postby SparkyST » Mon Aug 11, 2014 1:41 pm

Yes it would change the PH of the water, it would increase it a fair bit.
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Re: limestone

Postby Rockfish » Mon Aug 11, 2014 11:15 pm

As Sparky said, limestone will generally push the pH up, but it does depend on a few factors

For instance, harder forms of limestone like much of the 'ocean rock' you see for sale actually release very little and if your tap water is already on the alkaline side it often has very little effect. On the other hand, softer, more crumbly forms of limestone like tufa rock are much more likely to have an influence.

Volume makes a difference too of course, one smaller piece of harder limestone in a larger tank may have no noticeable effect unless the water was very soft and acidic to start with.

Due to the natural tendency of pH to fall over time as wastes are produced and processed, sometimes a small amount of calcareous rock, coral gravel, etc can actually have a useful buffering and stabilising effect on the water.

Remember there's lots of info at The Tropical Tank main site!
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