I got the DIY CO2 kit today and set it up using 1/2 tsp yeast, 1tsp baking soda...realized that yes I should have just used a soda bottle..but anyway do I need to turn an air pump on when I turn the lights off at night? Right now I just use their AQ70 to provide oxygen. Also, do I need to get a drop checker or do I just need to monitor the PH? And the PH going down even below 7 is okay for RCS?
My dad said he can build a CO2 system but he thinks just getting a 5lb cylinder will be easier than a 20oz so it might be a while until we can afford the regulator+filled cylinder.