Yes, pothos can grow in a fish tank! Not only do they look great and add a splash of greenery to the environment, but they also have several practical benefits. They filter out toxic chemicals like nitrates and ammonia from the water, improving your fish's health. Plus, their roots help oxygenate the tank and introduce beneficial bacteria into the system. One thing to keep in mind is that you'll need to change out some of your aquarium water weekly if you're growing pothos inside it — this will prevent an excess of nutrients from building up which could harm both plants and fish alike. With regular maintenance though, you should be able to enjoy having these beautiful plants thriving alongside your aquatic friends with no problems at all!