Flowering terrestrial plants for HOB filter?

[dagray]

So I know one can use elephant ear and other plants in an HOB filter to help remove nitrates (I don't have many under 10ppm), but I was wondering if anyone knew of a flowering plant one could use in the HOB filter as I plan to increase the bio-load on the tank in a while (could be a couple months, could be less, could be more) by adding some juvenile discus (a group of 10 or less), some dither fish (cardinal or rummy nose tetra), and a school of Sterbai corries.

Currently there are two harlequin raspboras, one glow light tetra (groups of smaller tetras I found get eaten by an oversized Raphael striped catfish in the tank) which will be moved to one of my smaller tanks as I get the biotope set up as South American with the exception of the Anubias plants in the tank.

Does anyone have suggestions for a flowering plant that feeds through the roots and doesn't need a soil substrate?

Thanks,
Dave

[robxc80]

So I know one can use elephant ear and other plants in an HOB filter to help remove nitrates (I don't have many under 10ppm), but I was wondering if anyone knew of a flowering plant one could use in the HOB filter as I plan to increase the bio-load on the tank in a while (could be a couple months, could be less, could be more) by adding some juvenile discus (a group of 10 or less), some dither fish (cardinal or rummy nose tetra), and a school of Sterbai corries.

Currently there are two harlequin raspboras, one glow light tetra (groups of smaller tetras I found get eaten by an oversized Raphael striped catfish in the tank) which will be moved to one of my smaller tanks as I get the biotope set up as South American with the exception of the Anubias plants in the tank.

Does anyone have suggestions for a flowering plant that feeds through the roots and doesn't need a soil substrate?

Thanks,
Dave

Peace lillies.