Sculk Growths will work perfectly underwater! Just beware, Sculk won't replace sand, so you may want to look for more gravelly areas.
Sculk Catalysts can be found in Dungeon, Stronghold, and Mineshaft chests!
Use Sculk Growths to your advantage and clean up that ugly stone quickly with a Sculk Catalyst, mob death, and a hoe!
Sculk Shriekers can be triggered using both Sculk Sensors and redstone!
Sculk Sensors can trigger Sculk Shriekers and give you the darkness effect. Be careful at night and in dark places!
Make Sculk Farms easily with mob spawners and lava. You don't even have to touch the mob, let the lava do all the work!