I have used Pothos for many years in tanks. My favorite use is for Betta bowls.
First buy a small pothos then rinse the soil completely from the roots. I like to use one gallon containers from Pat Catans and place the whole plant in the bowl. Place it in a window (I like north windows), let the water condition a few days and then add a betta. Never add plant fertilizer! Feed the betta floating food until the plant is well established. After a few months you will have lots of roots and you can virtually stop feeding the betta. They find all the nutrients they need on the surface of the roots, primarily infusorial organisms attached to the roots and plant tissue itself.
No air stones are needed. Bettas are labyrinth breathers and can live in very small puddles without aeration. Bettas have channels in their heads called labyrinths which they fill by gulping air. In Thailand they have been found to be living in water filled hoof prints of water buffalo.
The betta will be very healthy and content. They forage among the roots and build bubble nests. That's much better than an empty bowl. The roots give them something to do all day. The plant absorbs the nitrites and nitrates and maybe carbon dioxide from the water. So, the fish aids the plant and the plant aids the fish.
I like square bowls and I place them back to back across the window. That way they have some company. The vines grow to the floor. I trim them when the reach the floor, but I believe they will grow long enough to go across the top of the window. They grow that much. The water never smells even though I don't change the water very often, maybe once every two months or more.
This is a very fun project with fish. I am a microbiologist and love stuff like this. I have also been an aquarist for 51 years. This illustrates the symbiotic relationship of fish, plants water and air. It would be a good science project or exercise for science classes with minimal cost. The fish appear very healthy, grow to ripe old ages and maintain full finnage and beautiful color.