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Crushed Coral


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I know that crushed coral raises Ph over time. However, I was wondering how much does it ultimately raise the Ph? I know that different water conditions will effect this, but what might be a ballpark figure? For example if I need to raise a Ph of 6.5 to 7, about how long would that take? Would it get to 7? Would it stop at 7 when it got there?

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On 7/2/2021 at 8:39 AM, bettatester said:

I know that crushed coral raises Ph over time. However, I was wondering how much does it ultimately raise the Ph? I know that different water conditions will effect this, but what might be a ballpark figure? For example if I need to raise a Ph of 6.5 to 7, about how long would that take? Would it get to 7? Would it stop at 7 when it got there?

That is a pretty tough question to give an exact answer to. It depends on a huge number of factors. The pH of the source water, % water change, frequency of water changes, KH, GH, plant load, and total water volume, just to name a few.

The approach that @Colu listed above is sound. If you are starting with a slightly acidic solution start with a small amount of crushed coral/aragonite and give it a few days to adjust.

As an example, I have a 30cm pea puffer tank with Fluval Stratum as the substrate and filtered with a matten 30ppi matten filter. When I cycled the tank with just plants and substrate, the pH of the tank was ~6.4 (source tap water is 8.2). Before i put fish in it, I added about 300grams of crushed coral in a filter bag behind my matten filter. Within 48 hours, the pH of the tank was ~7.2, and it has remained that for the last 6 months or so.

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On 7/2/2021 at 5:22 PM, DShelton said:

That is a pretty tough question to give an exact answer to. It depends on a huge number of factors. The pH of the source water, % water change, frequency of water changes, KH, GH, plant load, and total water volume, just to name a few.

The approach that @Colu listed above is sound. If you are starting with a slightly acidic solution start with a small amount of crushed coral/aragonite and give it a few days to adjust.

As an example, I have a 30cm pea puffer tank with Fluval Stratum as the substrate and filtered with a matten 30ppi matten filter. When I cycled the tank with just plants and substrate, the pH of the tank was ~6.4 (source tap water is 8.2). Before i put fish in it, I added about 300grams of crushed coral in a filter bag behind my matten filter. Within 48 hours, the pH of the tank was ~7.2, and it has remained that for the last 6 months or so.

So 4 a 40 gallon thats stays around 6.5 to 6.7 you think adding 3 table spoons to start and give it a few days ?

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