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thank you for all advises guys, much appreciated! At the moment my my pH is 8.2 in the morning (lights off) and is 6.7 around 18:30 (15:00 lights on). I will lover the CO2 injection a little bit more and add fish in stead of shrimps the coming weekend. I also put the lights a few inches higher...

Looking at your tank Edwin; really a beauty! How do you decide the amount of CO2 you put in your tank?

Thanks Ian! Are you really telling that pH meters are not reliable? What about the automatic CO2 systems that keeps the water 24/7 on a certain pH level based on the adjustment in the pH computer? At the moment I'm doing 60% water change with tap water every second day; will there really be...

My water company reports a KH of 8 and I also measure this value with a KH drop test kit. Isn't a drop test based on the number of drops quite accurate as you don't have to guess based on a vague color? I'm pretty sure that the pH is quite accurate measured with my calibrated pH pen.

thanks for your reply Edwin and Ian! Well this is exactly what I mean; two different opinions - which one to follow? I also read several post on this forum that the drop checker isn't the right tool to measure CO2. Some discussion on this forum are talking about a pH drop of approx. 1 if you...

There are different opinions about the pH-KH table to measure the CO2 levels on this forum; mainly that you cannot trust it. (I to new to know what's true) Reading the table I have > 120 ppm CO2 at pH 6.3? - wow! So your advise is that I should adjust the CO2 to get a drop from pH 8.2 to pH 6.9...

I'm staring up a new tank for four weeks right now and I have reached the point where I want to add some Amano shrimps and Otocinclus. I have seen the first signs of brown algea, but that's probably related to the new setup. I have created a pH profile during one day with a calibrated HANA pH...