If you want to consider emersed plants, Pothos is average at best. Chinese Evergreen will filter the water much better, but the root ball will need to be aerated to ensure the roots get the nutrients from the water, so the plants grows and keeps the water pure for any fish you may want to add. Attached is a pic of one of my no water change tanks. I do have to replace the water lost to evaportation.
Good luck and above all, have fun.
I was so excited about this because I'm dying to try this with my tanks - and yours looks so
good, but turns out the Chinese Evergreen isn't suitable for me because I have cats. I just wanted to post this in case people have pets that can get to the plants...guess I'm on a search for non-toxic to cats plants...
Toxic to Horses, Toxic to Cats, Toxic to Dogs
Insoluble calcium oxalates
Oral irritation, intense burning and irritation of mouth tongue and lips, excessive drooling, vomiting, difficulty swallowing