Ferns

Ferns are undemanding plant, best suited for Low Tech aquariums and can be attached to driftwoods and stones. They also not need CO2 or High Lighting but will grow fast if provided these conditions. 

How to Grow your Java Fern.

https://www.2hraquarist.com/blogs/freshwater-aquarium-plants-guide/how-to-grow-java-fern-microsorum-pteropus