|Topic Review (Newest First)|
|01-23-2013 09:53 PM|
Originally Posted by funkman262 View Post
There are more expensive options, but these are usually outside the price range of the hobbyist.
|01-23-2013 09:29 PM|
|funkman262||The drop in pH caused by CO2 dosing shouldn't have any harmful effects on the fish. And like I said in my previous post, the only somewhat accurate way that the typical hobbyist can measure CO2 is by using a drop checker with 4dKH solution.|
|01-23-2013 09:26 PM|
Thank you everyone for your replies. So if I am correctly understanding what has been said, my tap water's readings of pH 7 and KH 10 do *not* mean I already have 30 ppm CO2.
If I inject CO2 into water with these parameters, won't my pH drop?
Also, if I can't use the pH/KH/CO2 tables to calculate CO2 ppm, how would I go about determining this?
|01-22-2013 04:05 PM|
|funkman262||I agree that using tank water is no way to measure the CO2, but a drop checker would be more accurate and fairly useful in a planted tank when dosing CO2. Since it uses a 4 dKH solution with typically just baking soda, then it's more accurate than testing the pH of the tank water since there's a lot more going on in there. However, I wouldn't consider it to being close to exact, but it's still a good indicator of the dissolved CO2.|
|01-22-2013 04:04 PM|
You can let a small sample of water rest overnight in a wide pan, or shake it vigorously in a bottle with a lot of air, to drive off CO2. Then retest pH.
If it rises a lot, I suppose it's possible that your tapwater really has 30ppm CO2. But a 50% water change will only raise your tank from 0ppm to 15ppm, and then only for a few hours. So you'll still need CO2 injection.
Otherwise, you'll need to do some more investigation into the cause of your odd readings.
|01-22-2013 03:56 PM|
|nilocg||Co2 related ph swings have no effect on livestock|
|01-22-2013 03:53 PM|
Thank you for your reply. If that is correct how would someone with my water parameters be able to dose CO2 without dropping the pH dangerously low?
|01-22-2013 01:01 PM|
|Cthulhu||It certainly does not contain 30ppm of CO2. There are other things in the water that can alter the pH or KH. That's why I really don't understand how these pH/KH/CO2 tables are supposed to be of any use.|
|01-22-2013 09:23 AM|
30ppm CO2 (rusty brain)
I've had a planted tank before, with pressurized CO2. I've had a year and a half break from aquariums, and now moved to a new city.
I've measured the tap water here to be pH 7 and KH 11. From the pH/KH/CO2 relationship tables, it would appear that my tap water already contains around 30ppm CO2.
Am I correct in thinking this? (My brain feels a little rusty on these matters)
If this is correct, I guess I won't need to buy a CO2 injection kit for the new aquarium I'm going to be setting up?