Re: [APD] stem rot

[Rex Grigg <rex at rexgrigg_com>]

To calibrate a test kit you just need to make a solution with a known 
ppm.  Then test that solution and see if the test kit agrees.

I would guess your needle valves are made by Swagelok.

Shutting off the CO2 flow at night will actually cause a pH swing.  But 
it really doesn't matter since fish are not affected by pH changes 
caused by CO2.  Normally in the wild pH changes are also accompanied by 
changes in the TDS and hardness of the water.  Swift changes in these 
values, TDS and hardness, is what can harm fish.  When you change the pH 
with CO2 both those values remain the same.

I would guess that it's a lighting problem. 23 watt spiral CF lights 
will only get at most half that amount of light into the tank.

echo172 at comcast_net wrote:
>> My suggestion is either carefully calibrate your test kits before  
>> trusting them, or don't use test kits to decide what or how much to  
>> dose.  Your symptoms sound like you have too little nitrate, and you  
>> do need CO2 or at least Excel if you are going to be dosing  
>> fertilizers.  How much light do you have on that tank?
>>     
>
> Vaughn
>
> 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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