Hello Everyone,
I have a quick questions that may or may not be answerable. Outdoor grows don't need c02 because theres enough out there in the air already. I'm growing indoor and I made my own two cent grow tent. I can't find the picture at the moment. It's a small personable grow. Started out with 4 plants now its one(only female thats what you get with the free seeds). 150w hps. This is my third grow and I just started flowering her. My question is... I live in a small apartment one bedroom and I leave my patio door open all day for my cat(litter box outside). I have that door shut off so he can't change rooms so its a 10x15 room. Not very big. Am I getting enough c02 or should I add more? I'm growing in the closet in a small 2x2x4 tent but it pulls in air from the room etc. Sorry high so its a big longer than I intended it to be.
Thoughts and comments welcome please.

Fresh air is fine for a indoor grow.

I asked that the other day over at my supply store and I was told not to even worrie about it unless you got something reallly big because of the displacement of Co2 and plus if theres one thing that having pets is , is that they breathe when your not there also creating co2 I wouldn't worry about it. I was wondering the same thing last week.

There's more co2 inside a typical residence than in outdoor air. All the hype about needing to add co2 is just another attempt by the industry to sell us more stuff we don't need.

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Thanks guys that reassures me. I thought it would be fine especially since I live in a densely populated city. Thanks for the fast response to.