Well, now you all have a design to use, go make one and try it out.

Vaughn, try this vs a drop checker glass bulb version.
I think you'll note a considerable difference in the response times.

Regards,
Tom Barr

Since my pH probe is pretty large in diameter at the business end, and isn't working right now, the only way I could try this is by using indicator solution in it. I have been wondering about trying that kind of device. But, then someone clued me into a Craigslist listing for a very nice 2 gallon nano tank for only $5 and within an easy drive from me. So, I picked it up today and am off on another crusade for the moment!!

very much true that this device does not need to be 24 hours/day in the tank. A thing I indeed overlooked.

greets,

yme

Well, once you make one, you will be in demand, it's the ultimate CO2 check.
It can sit in cup of DI water with a lid till you need it. Check the CO2 right before a water change. This is typically when the CO2 demand and system will be at the lowest level.

Most folks trim/prune after a water change/during etc. So you have less biomass= less CO2 plant demand.

There's also less organic matter thus less CO2 from oxidiation of DOC/POC waste, but that places less strain on the O2 supply, also a good thing.

This is another reason tanks look so good the day or two after a water change, more O2 and more CO2, even if folks test and the test kit does not assume a change etc.

Point is, now you can measure this slight change and see how CO2 really drives everything in a tank. Now try this for O2.


Regards,
Tom Barr

yes! very much true!
The only problem is that I have only one pH electrode that regulates the CO2 supply. So if I use that one for the measurement, the CO2 level of the tank will not be stable anymore. So the thing to do is find another pH meter!

greets,

yme