I have pothos in some of my tanks. The leaves are submerged. They have been like this for over a month and so far they have been fine. I have them stuck to the tank side with suction cups that are used for airlines. I like to keep the leaves just under the surface so my guys can sit on them.
Okay cool I have toooonnns of pothos starts that'll look great in my tanks..my betta Otus has taken a liking to building bubble nests around the leaves that are on the surface, partially in the water. My Snails like them too