(List added by @Twrist)

• Tropical plants should spawn only in tropical biomes
• Corals and seaweeds should spawn in overworld oceans
• Aquatic mobs should spawn in overworld oceans

I just wanted to leavesome suggestions. I think Tropical plants should spawn only in tropical biomes as jungles or marshes. It would be more logic and realistic, it kinda breaks the world generation they spawn everywhere. Corals and seaweeds could spawn in the ocean too.

It would be awesome too if some mobs, notably aquatic mobs, could spawn in the world, it would make the sea less empty.

I think the best way to integrate it would be to make dimension and biome whitelist/blacklist. ;)

Thanks for adding some mobs to overworld, but most of the mobs still don't spawn like the fishes. Water mobs should be able to spawn in normal water, and maybe other modded water with a whitelist. Tropical plants still spawn everywhere, and not only in tropical biomes.