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[APD] Re: CO2 indicator

> I think a bubble rate counter would be an easier method and close to 
> the same range of this.

So then I determine the correlation between CO2 level (as measured by 
offline KH and pH levels) and bubble rate for my system? So then if 
bubble rate is okay, CO2 should be okay?

> But a pH monitor would be better... if you want constant CO2
> determination.

I'd love a pH probe, but definately can't afford one. That's why the 
cheap and nasty CO2 indicator appealed to me in the first place.

> Folks seldom use these CO2 indicators anymore but they do alright.
> Dupla and a couple of other companies made them. Folks tried         
> everything to DIY a Dupla component. But many you did not need. This 
> was one of them IMO.

I realise that this type of thing is not a necessity and cannot replace 
offline measurements, but thought it might be good as any early warning 
sign if CO2 levels got too high (although after reading a few of the 
recent posts I'm not to sure what level of CO2 would be considered "too 
high"). Maybe I just won't bother and go for the bubble counter thing 

> But a simple spreadsheet could easily convert folk's routines into a  
> weekly ppm rating if that's what you are after.

Yep, I sometimes do calculations like this to get a better 
understanding of what other people are adding to there aquariums. But 
what works for me may not for others, so I guess I'll just keep doing 
the calculations myself.

> I've come up with fairly decent daily usages for NO3, PO4 at least   
> what I would consider primarily plant uptake and a good CO2 level    
> which applies to all CO2 enriched tanks, low, med, high light etc.

This sounds interesting, can you please elaborate. I'm guesstimating 
about 0.2ppm phosphate per day and 1.25ppm nitrate per day for my 

> The others are all in fairly excess and hence their dosages/uptakes  
> are estimated.

So as long as you're not seeing deficiency symptoms for K, Mg, Fe, and 
traces, the levels/dosage is probably okay?

Thanks again for your reply Tom

Clint Brearley
Melbourne, Australia

> Regards, 
> Tom Barr 

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