Aquaponics Aquarium

There is this plant that I bought in aquarium shop that I never manage to grow them successfully in my low tech tank setup. So I try to grow them in my tank filter, sort of like aquaponics style.

The plant in immersed form which I never know the name. Although they do last a very long time in my low tech tank, but they never show any sign of growing when immersed.

aquaponics aquaponics
A weeks after I leave some of it near both of my aquarium filter. The roots are growing.

I know some people did similar thing with pothos plants, and I am wondering it anyone did this with sweet potato.