Re: [APD] stem rot

["S. Hieber" <shieber at yahoo_com>]

If you want to shut off CO2 at night, you probably won't maintain a constant pH, it will probably rise slightly over the course of the evening, not that the rainbows will give a hoot about the pH.  You can expect a swing in pH of roughly 0.2 units over the course of 24-hour period. Something 10 times that large a swing would probably not matter to rainbows.

You can calibrate a test kit by using it on a sample of known value such as a solution of distilled water which you dose with a measured amount of material added. If you're trying to calibrate a CO2 test, distilled or RO water with nothing added should reflect the amount of CO2 that the water would pick up from the air -- in which case you would expect the titration to indicate only a few ppm.

Have plants, have fun,
sh
 
 

 
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----- Original Message ----
From: "echo172 at comcast_net" <echo172 at comcast_net>
To: aquatic-plants at actwin_com
Sent: Tuesday, January 2, 2007 9:53:18 PM
Subject: Re: [APD] stem rot




Calibrate a test kit, how?
I have 4 CF screw in bulbs, new, 23 watts each. two per dome.  AHS CF kits still in storage, about 8 55W with ballasts. Adding light is not a problem in the near future.
I have two co2 bottles with precision needle valves. I forgot the name, a company  in PA, can meter a bubble a minute if I recall. I want a solenoid to shut off at night to maintain a constant pH. All this is for some rainbowfish that I've tried to get for years. 
I've been adding nitrate, it's 10 ppm. I know it's low.
I need co2 because I keep pH at 7.6 for the rainbows. The hach kits shows about 13ppm co2. I use excel daily.
Thanks very much
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