Vesicularia dubyana is found in Southeast Asia. Sometimes it grows out of the water in shaded, moist areas. It can get by on 1/5 to 1/10 of the minimum light a sword plant would need, though it will grow better with more light. It is a good ammonia sponge and a place which not only shelters fry, but also where all sorts of microfoods will grow. If your fry are picking on a plant, they may really be eating tiny animals.

I encountered an article where they suggested "be ruthless, throw the extra out". When it can be so beautiful in quantity and so easily passed on or sold, that seems like a very strange, short-sighted and selfish recommendation.

If it gets infested with hair algae, take it out and bag it in clean water. Toss it in a dark corner for a few months. When the hair algae has died off, rinse it and put it back in a tank.

One caution, it is sensitive to medicinal dyes such as acriflavin and may be killed by treatments for things like velvet. If you have to treat a tank with such a dye, as soon as the entire treatment period is over, change out the water and put activated carbon in your filter to absorb any residual dye.