OK so I have a DIY CO2, and I recently built a rex style in line reactor to my eheim. I previously had it going through a power head. The improved CO2 dissolution was dramatic and I almost gassed my fish ( I have 3 2 litre bottles on a 46 gallon tank). In the past I have always let the CO2 go overnight, however now with my increased dissolution efficiency this does not appear to be a viable option.
So I set it up so that I can detach the CO2 from the reactor, which I though would stop the fish from gasping at the surface...
As I sit here typing, I am looking at my tank and every single fish is at the surface of the tank. There is no CO2 being input since I turned off the lights, so why would they be at the surface?
I should also say that I do not have a drop checker, so I cannot see what my ppm CO2 is. I was just wondering if anyone has experienced this before. They were perfectly fine before lights out, so it seems unlikely that the CO2 would increase without any other input... Am I missing something here?
Thanks for the help, sorry for the long post.
fish look to be gasping at night even without CO2 input...why?