Ph Dropping!


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Nellie75

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55 gal
0 Ammonia
0 Nitrites
6 PH from 7.6
15 Nitrate

6 Angel fish
5 black skirt tetras
7 neon tetras
6 ottos
1 small pleco

48" Finnex Planted 24/7 LED
Penn Plax 1000 Canister filter
Aqua Clear 70 HOB
CO2 is about 2 BPS

Just started my CO2 about a week, yesterday I did a 15 gallon water change to raise my PH a bit without shocking the fish.

Is there anything I can do to stabilize the PH drop?

For today I dosed some baking soda to bump up the PH.
 

-Mak-

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From what I've read, a ph drop from CO2 isn't anything to worry about, because it isn't a drop from a decrease in water hardness. Stable KH and GH are more important. Using baking soda is too sudden of a change.

Are you using a drop checker?
 

Nellie75

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Well I only dosed baking soda for the amount of 10 gallons.

I'm using the API liquid test kit, so I shouldn't worry about the PH drop? Seeing the PH go from a light blue to light yellow scared me.

I just googled what a drop checker is...no I do not have a drop checker, I have a bubble counter that's outside the tank.
 
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-Mak-

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I just googled what a drop checker is...no I do not have a drop checker, I have a bubble counter that's outside the tank.
Bubble counters don't tell you how much CO2 is in the tank, it just tells you how many bubbles you're injecting. The CO2 levels depend on the type of diffuser, surface agitation, tank size, plant uptake, etc

I suggest you get a drop checker. You don't want to inject too much and gas your fish. A drop from 7.6 to 6 or lower does seem a bit much.
 

PilotWhale

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So, I added CO2 and I killed 9 fish. pH dropped 1.2, from 8.0 to 6.8. I'd be careful. Do it slowly, not like how I did it.
 

-Mak-

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So, I added CO2 and I killed 9 fish. pH dropped 1.2, from 8.0 to 6.8. I'd be careful. Do it slowly, not like how I did it.
The ph drop is normal. Perhaps you injected too much?
 

Dcchillin

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I'm getting ready to start injecting co2 on my 20g next week. Howuch pH drop should I expect? I haven't really been able to find any info on this and I want to make the transition as least stressful for me and my fish.
 

-Mak-

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I'm getting ready to start injecting co2 on my 20g next week. Howuch pH drop should I expect? I haven't really been able to find any info on this and I want to make the transition as least stressful for me and my fish.
Depends on your KH and other buffers in the water, but I think a drop of 1 is typical. It's not really stressful for fish because the ph drop isn't a result from a change in osmotic pressure.
 

Dcchillin

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Ok, thanks mak. Any advice on some further reading on this topic?

I know my kh is 5/6. I mix my own from ro so it can be adjusted if need be. I'm setting everything up later this week so I'd like to get prepared.
 

-Mak-

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Ok, thanks mak. Any advice on some further reading on this topic?

I know my kh is 5/6. I mix my own from ro so it can be adjusted if need be. I'm setting everything up later this week so I'd like to get prepared.
You might know all this already, but here are some good solid basics:
CO2: Striking the balance

Tom Barr's website might have more on CO2 in planted tanks.
 

Dcchillin

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Thanks bud!

If I'm reading that chart right, my current water parameters of 5kh/7.6ph means only about 3.7mg/l of co2 in my water? Or is this chart not applicable to liquid co2?

If it is it might explain my miserable results so far.
 
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-Mak-

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Liquid CO2 isn't really CO2 at all, so CO2 charts, drop checkers, etc don't apply.
 

-Mak-

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So for clarity, it's chemicals that some plants will break down for CO2, but not free CO2 for the test kits.
I'm not sure what exactly it does, but even if it does release CO2 (which I don't think it does) it's not enough to register on a test.
 

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