Forge Mods for Minecraft Java
Browse 10 free Forge mods for Minecraft Java — popular picks include Rainbow Reef, Aquatic Additions, Mo' Creatures Extended.
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Rainbow Reef
Rainbow Reef is a mod that adds content to spruce up your in-game aquariums and coral reefs, including lots of new fish and sea creatures!
Aquatic Additions
Aquatic Additions completes the vanilla turtle armor and adds an upgraded version to enhance underwater exploration
Mo' Creatures Extended
Continued maintenance for 1.12.2 – Adds several animals, monsters, aquatics and insects to the world of Minecraft!
Aures - Sea Dwellers
Underwater villages and sea traders with random generation. Vanilla style.

Pufferz
Want more aquatic animals & plants to fill your aquariums? Well then look no further!
UnderDasea
A mod that aims to add life to the oceans.
bigfish: ripple
Expand vanilla fishing with new fish, attributes, collection records, bounties, QTE fishing, cooking, placeable food, exploration tools, and progression-focused aquatic gameplay.
Azúl
An all-new dimension featuring a gigantic ocean surrounding it, and its magnificent fauna—or perhaps just a simple fauna mod?
Womp's Shellfish Mod (1.21.5, 1.20.1) – Fishing Just Got An Upgrade
Womp's Shellfish Mod adds new life into Minecraft’s oceans, lakes, and beaches by adding 9 new shellfish, 6 aquatic plants, and 30+ food items. It introduces a new fishing mechanic with shellfish traps and overhauls water-based worldgen. Features: 9 new shellfish that spawn across oceans, rivers, and beaches. 6 new aquatic plants for better underwater […]
Subaquatic
Adds lots of ocean related things to 1.12.2! Including real ocean biomes, bug fixes, new mechanics, and more!