Thank you a lot!If you mean by filtering, acting as a sponge for nutrients like nitrate?
As far as terrestrials go, just about any tropical plant from wet areas will do. I am using Diffeanbachia and Pothos (among others) in the photo below on the surface of my 180 gal tank.
View attachment 1474928
As far as marginal plants (semi-submerged) below is Papyrus, in my 125 gal sump/refugium.
View attachment 1474929
The top portion of the plant, needs to grow above the water line (as in the sump above)
The roots are submerged.
View attachment 1474930
And of course all aquatic plants help somme degree.
But the plant mass must always far exceed the fish load (aquatic, terrestrial, and marginal) to be effective.
The sump below also contains a heavy growth of Vallisneria
View attachment 1474931
With my heavily planted sump and tank (and regular water changes), nitrates are kept below the 5ppm level
View attachment 1474932
Yes,i know i am going to put a lot.The key seems to be density, if you want them to help with filtering nitrate there needs to be a whole lot of plants and they need to be actively growing (have strong enough light and nutrients). Buying a couple aquatic plants won't do much, having a tank that is thickly packed with them will.
Pothos can also be grown in a filter box above the tank, basically a flower pot with a water pump which drains the water back into the display, and has tons of pothos growing .
Yess i Know.Also important to remember - Plants won’t replace the need for some water changes, even if with low fish biomass, the plants may get rid of much of the nitrate.
I agree, great stuffI like duckweed...
I prefer Giant Duckweed (used to be Lemna major, not sure what they are calling it nowadays), which is about twice the size of the common variety (Lemna minor) and to my eye much more attractive. L.major seems able to outcompete and eventually replace L.minor in my tanks, with the help of some selective culling.