CO2 @ 120 ppm??? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 12-01-2006, 12:14 AM Thread Starter
 
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CO2 @ 120 ppm???

After re-establishing (and deciding to take care of) my tank. I have been taking weekly measurements. Something is wrong. I am dosing Greg's ferts, and pumping CO2 to the point my ph is down to around 6.0. My tap has a kh of 2 and a gh of 1.5, ph around 7.1 or so and a TDS of 45.

After 1 week running, the tank measures TDS of 250, ph 6.0, kh 4, and gh of 6 (nitrates still stubboringly low at less than 5).

A ph of 6.0 and a kh of 4 is supposedly 120 ppm of CO2. Now, I recognize that the chart is not super accurate, but come on, could it really be THAT far off? FWIW - all fish are behaving perfectly normal (other than some clown loaches that seem a bit m ore shy than "usual."

Lastly - It is a brand new TetraTest Laborett test kit..

ideas?
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post #2 of 9 (permalink) Old 12-01-2006, 12:21 AM
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I wouldn't trust the test kits. The graph isn't perfect either. Are your fish in distress? Are the plants looking healthy, pearling, etc? I have test kits that I used to use religiously, but I rarely use it now. When I use it, its just to test ph, kh and nitrate just to get ballpark ideas.

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post #3 of 9 (permalink) Old 12-01-2006, 12:55 AM
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See threads about KH reference solutions.

This will help.

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Tom Barr




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post #4 of 9 (permalink) Old 12-01-2006, 05:15 AM
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Is your tap pH of 7.1 a standing pH, or straight from the tap? What are you dosing to raise your KH?

Sergio C.
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post #5 of 9 (permalink) Old 12-01-2006, 11:50 PM Thread Starter
 
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Serg - where is the table that shows the kh of water at a given ph? I may be mistaken on the ph.. I need to draw some water and let it sit overnight to stabilize then test again..
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post #6 of 9 (permalink) Old 12-02-2006, 12:28 AM
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120 ppm of CO2 would kill the fish. So, you don't have that much. Check this thread: DIY Drop Checker - Aquatic Plant Central- aquascaping...a living art, and yes it is at "another" forum, but it still gives you the information you need.

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post #7 of 9 (permalink) Old 12-02-2006, 03:59 PM
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Will it really, Hoppy? It was my understanding that its not the Co2 that actually kills the fish, but the inherant lack of O2 or the ph crash, which can both be remedied.

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post #8 of 9 (permalink) Old 12-02-2006, 08:52 PM
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My understanding, which makes sense to me, is that fish can only respire CO2 if the CO2 concentration in the water is less than in their blood. So, when we raise the amount of dissolved CO2 in the water the CO2 level in the fish blood goes up too, and that is what suffocates the fish. I also doubt that any CO2 concentration that we can easily achieve in our tanks is high enough to limit the amount of O2 that can be dissolved into the water. I do know that the drop in pH from adding CO2 isn't what bothers the fish to the point of harming them. Too many people keep fish at very low pH - below 5.5 for example. Unfortunately, I don't have the knowledge to be sure that I am correct about any of this.

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post #9 of 9 (permalink) Old 12-04-2006, 07:04 AM
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Sounds right. As we all know, fish die for a multitude of reasons...one of those being when Co2 tanks dump. The same happened to me once, or rather, it was somehow turned up. I came home from a weekend away to find the Co2 bubbling way too fast (6-8/sec) and all the fish in the tank were dead. Deaths like that are either what you said about the ph of their blood, or the rapid change of ph. Gradually, I agree that they can withstand very low phs. I had my kribs and other tank inhabitants around 5.9-6.0 when they were breeding...no problems.

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