Film on top of water from co2 injection?

Question

I started injecting one of my tanks with diy co2 this week and there is a thin translucent white film forming on the top of the water. Is there anything I can do about that, or is it normal? Is it from the reduced surface agigation, or some chemical reaction from the co2?

I have one 2l bottle flowing into a hagen bubble ladder diffuser, and then the output of that goes into a plastic cup full of filter floss.

The other 2 L bottle goes into a ceramic micro-bubbler, which then flows into the input of my magnum 350 canister filter.

Answer 1

I would look to a chemical reaction from the co2. Check the carbonate hardness in the tank, that would be the first reaction you would get that could produce a white film. If that's the case you would also see a drop in pH soon from the carbonic acid, but your hardness would have to be extremely low for that to go more than .1-.2 pH drop. Distilled water can drop to below 6 from co2 injecton and no carbonate hardness to buffer it.

Answer 2

Do you have like a bubble stone or something like that? Because that will affect the c02 injection