Plant ID app
I'm not at all sure how this will work with aquatic plants but I find it works well for garden plants and many of the group do both so a bit of info? It is an app that gives you a space to center a photo of the plant, take a picture and then it sorts a database for the ID. Handy when hiking and you find those little things that you've never seen before.
Try it if it sounds good to you:
Like that garden app