Ph - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 13 Old 04-08-2013, 04:00 PM
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Originally Posted by MoneyMitch View Post
you have this revers, ph lowers not raises :P

Actually it works both ways.

raising pH lowers co2

lowering co2 raises pH.

With planted tank I emphasize the later. As the plants lower the co2 the pH rises. Just as adding co2 lower pH.

for the really nerdy:

CO2 (atmosphere) + H2O <->H2CO3
H2CO3 <->HCO3- + H+
HCO3- <->→ CO3-- + H+

maintain Fw and marine system with a strong emphasis on balanced, stabilized system that as much as possible are self substaning.

have maintained FW systems for up to 9 years with descendants from original fish and marine aquariums for up to 8 years.

With no water changes, untreated tap water, inexpensive lighting by first starting the tank with live plants (FW) or macro algae( marine)

see: http://www.tropicalfishkeeping.com/a...-build-295530/
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post #12 of 13 Old 04-08-2013, 04:05 PM
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if you notice some plants will use CaCO2 as a carbon source which has a direct impact on your kh which in turn effects your ph. the more caco2 the plants use the more your kh will lower in a result of a lowering ph. the naturally occurring co2 in a tank is minimal and the built up stores are used within gthe first few hrs of light on. the effect of naturally occurring co2 on ph in a aquarium is minimal. about the same as the plants using the caco2.

*shrug*
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post #13 of 13 Old 04-08-2013, 04:15 PM
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Originally Posted by MoneyMitch View Post
if you notice some plants will use CaCO2 as a carbon source which has a direct impact on your kh which in turn effects your ph. the more caco2 the plants use the more your kh will lower in a result of a lowering ph. the naturally occurring co2 in a tank is minimal and the built up stores are used within gthe first few hrs of light on. the effect of naturally occurring co2 on ph in a aquarium is minimal. about the same as the plants using the caco2.

*shrug*

Agree

except that with a heavy fish load there is significant co2 in the water.

And I remember seeing one analysis by dr randy holmes farley that plants actually return carbonate to the system as they reduce nitrates to plant tissue. And in the same amount the aerobic bacterial used up the carbonate (alk).

From the same article the anaerobic /anoxic bacterial also add carbonate consuming nitrates.

My observation is that even with peat moss in the substrate I have a pH of 8.4-8.8 (api high range test kit) in my tanks.

my .02

maintain Fw and marine system with a strong emphasis on balanced, stabilized system that as much as possible are self substaning.

have maintained FW systems for up to 9 years with descendants from original fish and marine aquariums for up to 8 years.

With no water changes, untreated tap water, inexpensive lighting by first starting the tank with live plants (FW) or macro algae( marine)

see: http://www.tropicalfishkeeping.com/a...-build-295530/
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