i have started up a world right on the day after 1.13 was released. I planned on making a ocean base in a warm ocean. i soon found a lukewarm ocean that had a slime chunk and a ocean monument right next to it and i chose that as my base point and called it good. but then i found out i need corals. i searched 1000s of blocks to find no warm oceans. i don't need a corral reef but i need a warm ocean to make a farm to get coral reefs. i went in a creative world to hopefully teleport to enough spots to find a warm ocean, but i found none. i am still searching to no hopes of finding a warm ocean. please help me on this.
Search for a reef in the center of a lukewarm ocean near the coast to ensure the greatest chance of finding a warm ocean. They may be rare even then but they are not as rare as mushroom biomes in my experience. Also remember that land/beach temperature have no effect on ocean temperature (MC-126009).