Member

Posts: 16
From:san francisco, ca, usa
Registered: Nov 2003

posted 01-14-2004 09:39 PM         

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will the co2 harm my guppies?

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Member

Posts: 100
From:
Registered: Jan 2004

posted 01-15-2004 08:02 AM         

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how much co2? can you give any more detail? what size tank? how many guppies that type of thing

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Member

Posts: 266
From:Canada
Registered: Sep 2003

posted 01-15-2004 01:37 PM         

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CO2 at high concentrations can be toxic to fish. How much CO2 you require depends on how big the tank is, how heavily it's planted, how agitated the surface is and what kind of fish you have. A safe range for fish that is adequate for most plants is generally in the 15-25 mg/L (ppm) range. Most fish are OK below 40-50 mg/l.

Depending on where you live (ie: your tap water conditions) you may also want to keep an eye on your KH and PH when adding CO2 (CO2 will drop PH). In the area I live the KH is moderately high, so addition of CO2 does not swing PH very much.

If you have low KH, you can buffer it by adding sodium bicarbonate. Caclium carbonate will increase both GH and KH - probably not what you want. See the chart at http://aquaticconcepts.thekrib.com/Co2/#table for more detail.

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