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All this talk about CO2 concentration and why CO2 turn on two hours before lights on got me thinking about how does the CO2 concentration vary with time for our CO2 injected high tech tanks. Well here is my stab at the maths, remembered from A level maths 35 years ago (oh and my maths books)...

Almost every couple of days there is someone on this forum who reports they cannot get their drop checker to change colour despite everything they try. In almost 100% percent of the cases it because of poor CO2 injection and distribution in the tank. However, despite many members repeating the...

Been niggling in my mind for ages about CO2 and rubber and silicone as a general no no in aquatic world, but not seen any real evidence of why not. (OK someone in US tried 25m of silicone tubing as tank CO2 diffuser and got nothing and others report issues with clear vinyl tubing cracking)...

Saw something somewhere, where the CO2 was turned of an hour or so before lights off, but air via air stone turned on an hour after lights off (and off an hour before lights on) so as to re-oxygenate the water during the night for both fish and plants. Anyone got any comments on this regime ...