I am currently operating a small 1.5 feet tank without CO2, you can try simple plants like small crypts (parva, willisi etc), hairgrass, blyxa japonica, anubias nana, marselia crenata etc. Moss will be nice also.
fishes, do not load too many, a few small boraras, ruby tetras etc should be nice. keep it simple for a small tank.
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