Mike it is much easier to use the drop checker. Although both the meter and the and drop checker are measuring pH (the bromothymol blue is a pH indicator), you know the carbonate hardness of the drop checker solution, but not of the tank/tap water.Hi Darrel - what if you're using a PH pen to measure CO2? Does the hardness of the water make a difference here? So in standard (hard) London tap water, what's the CO2 drop that we should be aiming for?
You could use both the pH meter and the drop checker to give you an index for your water, you would measure pH every 10 minutes or so as the CO2 comes on and builds up, and the drop checker changes colour. This would then allow you to just use the pH pen, but it would be more prone to error (if the water had a different hardness to when you performed the calibration run etc.)then measuring the PH change of that compared to the water pre-injection, and then using the PH pen over time to adjust rates and try and get it stable / peaking at the right time.
I'm not a CO2 user, partially because I would always be worried about gassing my fish, but you could observe the fish. I think there are sub-lethal effects to high CO2 exposure, so I would be looking at a lower CO2 level.You could get a fairly quick response from the fish in terms of being more active as the CO2 level drops. The other problem with fish behaviour is that there will be differences between fish species dependent upon the "Root" effect < Fish Respiration>.Is it essentially using a drop checker a bit and mainly watching fish to see what the optimum CO2 level is - i.e. the highest we can get away with before fish behaviour is affected
That sounds about right.1. Take PH of water using pen pre-injection
2. Get the CO2 level right with injection using drop checker and fish as guides
3. Measure PH of water throughout photoperiod to see how quickly CO2 level ramps up to ideal rate, how stable it is during photoperiod and how quickly it declines after injection stops
4. Adjust CO2 injection start time, end time (and possibly rate) to make sure it peaks just before lights on and then remains stable until lights off
5. Repeat 1-4 if necessary to fine tune
6. Once sorted, monitor in general using drop checker
I've just seen I've never answered this one. The reason is to do with the solubility of gases, but at sea level, at 27oC, pure H2O is saturated with 7.9 mg / l O2, but with only 0.42 mg / l CO2. You can see straight away that CO2 is actually lot more soluble than oxygen, but occurs at a much lower percentage in the atmosphere (400ppm for CO2 & 21% for oxygen).Hi Darrell, if the air has ~400ppm CO2 currently why does the water only take up ~11ppm in a low tech (this is what it appears to be in the figure above)?
|CO2Art In Line Diffuser or Drop Checker issue?||Carbon Dioxide (CO2)||10|
|V||Colour of drop checker?||Carbon Dioxide (CO2)||5|
|Where can i get a big bottle of drop checker solution??||Carbon Dioxide (CO2)||18|
|Which drop checker would you trust?||Carbon Dioxide (CO2)||29|
|W||ph drop during co2 injection||Carbon Dioxide (CO2)||22|
|W||co2 drop checker colour||Carbon Dioxide (CO2)||10|