Waa.... slowly growing stem plants are already few in numbers. And you looking for fine-leaf ones as well?
I am not sure. But maybe you can try the below non-fine leaf stem plants. They are slow-growing, in my experience.
- A.reineckii
- Hottonia
- Lobelia cardinalis
- Polygonum sp.
- Tonina ?
If you want fine-leaf ones that grow slow, why not go low-tech and do away with the CO2?
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