Mangrove seeds

My son is looking for mangrove seeds or plants for his saltwater fish tank. Anyone have any to trade? What would you like in trade?

Thanks
Betty

Is his tank set up where young mangroves can grow above water? If memory serves, they seem to prefer to only have their feet submerged as opposed to the whole plant.

Yes he has all sorts of things running his tank. He wants them to go in his filteration system.