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TDS meter. About $10 from ebay. Or "only a million billion dollars" at Dallas North Aquarium.

Turn on, stick in the water, read the number.



--Nikolay
 

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I wouldn't buy any gizmo that monitors/test the CO2. Observing the plants and the fish is the best way.

As long as you have normal flow in the tank (and a little bit of ripples on the surface for gas exchange) the CO2 will be fine.

The issue with DIY CO2 is that it can easily be inconsistent. Best practice is to renew the yeast/sugar mix before it stops working. Like every 4 days or so, just to be consistent. Inconsistency in planted tank leads to beautiful, highly educating, issues.


--Nikolay
 
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