Is PH fluctuation Normal ? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 07-20-2011, 07:50 AM Thread Starter
Join Date: Jul 2011
Location: United States
Posts: 3
Lightbulb Is PH fluctuation Normal ?

The Tank :

Size : 8 Gallon (30 Litres)
Substrate : Peat moss + Vermiculite + Coco Peat + Gravel (medium)
Co2 : DIY Co2 Kit @ 6 bubbles per minute
Light : 19 Watts Tube + 45 Watts Tube (Boyu)
Temp : 19 - 24 C (66 - 75 F)
Plants : Hemianthus Callitrichoides (Dwarf Baby Tears) +
Hygrophila Difformis (Water Wisteria)

The Issue :

My PH meter (Pinpoint) shows reading
as low as 6.4, when the lights are on and the Co2 is diffused
as high as 7.8 when the lights and Co2 are stopped.
Is that NORMAL ? My plants and shooting new shoots and seem to
be doing well.

I am also concerned as to what will happen when the fish come in.
Will this fluctuation of PH suit them.

Kindly Help !
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post #2 of 4 (permalink) Old 07-20-2011, 10:48 AM
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Join Date: May 2011
Location: derrty south
Posts: 726
yep will be fine

ΔΙΡΤ Fraternity, Inc. #33
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post #3 of 4 (permalink) Old 07-20-2011, 11:22 AM
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Join Date: Dec 2010
Location: Binbrook, Ontario, Canada
Posts: 430
CO2 will cause your ph to drop fairly quickly and then rise again when it goes off - this is normal and does not affect your fish. Mine fluctuates as much as 1.5 down and up.

On the other hand, drastic fluctuations in PH caused by changes in water chemistry can have negative affects on your fish, for example when you do a large water change or add substrate or certain types of rocks or chemicals to your tank.
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post #4 of 4 (permalink) Old 07-21-2011, 05:17 AM
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Join Date: May 2008
Location: Mableton, GA
Posts: 6,158
I have read at Barrreport that in nature Ph fluctuation occur from daytime to nightime. Just want to be careful if you have sensitive fish like Ram cichlids. What fish are you getting?
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