Vegetation in New Cave Water

Although the water lakes and seas that can be found in the new caves are great, they lack one thing: vegetation. The oceans had this same issue before the update aquatic. I think it would be ideal to have some sort of cave variant or version of kelp and sea grass, just to make the lakes in caves feel less barren. This would give some extra variety and I could see different vegetation underwater depending on the biome of the cave.