I think that it is good that this mod 's mobs spawn overworld ocean (including Biomes O' Plenty).
Because I think that the sea of vanilla is too small of the type of mob.
However, from the default, this setting has no meaning to go to Tropicraft 's dimension, so I want you to be able to set it in Config.
I'm sorry, my English is not good

Although it will be selfish, if the setting was set to true, I think that Piranha should be spawned in a jungle or swampland.