Blue-Poison Dart Frog

The Blue Poison-Dart frog lives in the coastal rainforest, but how would their traits change if their ecosystem changed so it was completely underwater? First their skin color would change from a blue that blended in with the ocean to a color like orange that would warn the predators of their toxins. They would also need gills to breathe underwater and fins to help them swim better. Two traits they would keep are the webbed feet they have to swim around and their permeable skin that lets the absorb water and oxygen.