Hi again sweetie. First off for fungus gnats, here is a link I saved to read myself as I think I have those little blitters.
FUNGUS GNAT MANAGEMENT I haven't read it yet, but hope it helps.
Next, get smaller pots as I told you before. They don't look well. Kinda looks like I do today, a little lime green around the gills! LOL! I have coughed so much I put my back out. damn. Also, what soil DO you have those kids in ? And unless you have a sealed area, like a box or cabinet, you are not going to get much from the co2 device of yours. I admire your enginuity though. Very good work.
We will get you there, girl. Not to worry. Cute kitties. I have 2. One I would like to string up as it isfrom my ex to my daughter without my permission and sprays all over,pretty feral from the get go, the other is my man's and is a sweetie. Mostly I have dogs. a few....
Your kids don't look like they are going to die yet, so get back to me about what you want to do to help them.
Peace