Pothos are a really good idea for filters my fiance already has that plant in his crabitat but i never really thought of using it in any of my filters although it is a good idea. Now onto the plants cleaning air. ALL plants clean air, that is how a plant works. Instead of breathing in oxygen like we do, it breaths in carbon monoxide and releases oxygen which is what we use. this is why plants and trees are so important. i find it funny when i see tags on plants that say cleans air! and produces oxygen! ive seen this at walmart attached to their house plants. they are treating people like they are stupid trying to sell more plants but it how a plant lives and grows! lol :)
Chinese evergreen, peace lillies, and arrowhead plants are by far the most durable in just about any lighting. I've been trying philodendron species but they can be very picky and grow large. Pothos always rot out over time, with me at least.