pH levels

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I am just understanding the levels of ammonia / nitrite / nitrate plus salinity.  I now need to test for pH and have just ordered a kit.  Can you explain (in simple terms) about the pH levels - e.g. what causes it to rise / fall and anything else I need to know about it please.

Adenium Phil

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Reply #1

Ph can be affected by light and water movement  I believe and drops in the evening when lights go out which is normal. So if you test say in a morning when the lights have just started it will be a little lower than if you check it when the lights have been on / are on full whack.
Let the pros explain it better than me though  :S

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Marty

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Reply #2

The above sums it all up correctly :)

Debbiem

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Reply #3

thanks so when I test and it is low or high - it is just adjusting water flow / lighting times?

HK_Fuey

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Reply #4

Lighting doesn't affect pH per say, but they're linked...

pH is mostly effected by CO2 levels.  During the day, when the lights are on, coral and algae use up CO2 through photosynthesis to make oxygen.  At night there is no photosynthesis going on, so the CO2 that your fish, shrimp, crabs, etc. exhale builds up.  The increased CO2 will lower your pH. 

Good gas exchange at the surface is also important - high flow doesn't always mean good surface agitation, but it does tend to be the case.
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