
Bacillus
A remake of the original Bacteria mod by TeNNoX with extra features for 1.21.x (and beyond).
Screenshots




About this Mod
This mod is a Work-In-Progress.
Bacillus is a remake of the mod Bacteria by TeNNoX.
Some textures used in the mod are from the Bacterium mod by InEqualMeasure.
We offer versions on CurseForge: https://www.curseforge.com/minecraft/mc-mods/bacillus
Requires the Architectury API
Forge version requires Kotlin For Forge
Fabric version requires Fabric Language Kotlin and the Fabric API
Destroyer Bacteria

- Takes in a set of blocks above itself as a filter and spreads to those blocks, destroying them.
Replacer Bacteria

- Takes in the block directly above it to replace blocks below it with the supplied block.
- Blocks placed on top of the source block are used as a filter to only let the replacer bacteria target those blocks.
Both bacteria are activated using a redstone signal
Note: The block directly below the bacteria is implicitly added to the target filter.
Compacted Must

- Used in crafting bacteria blocks and the jammer.
Jammer

- Used for jamming and/or killing all bacteria in the world.
- Use in main hand for jamming bacteria.
- Use in off hand for killing bacteria.
Available Versions
How to Install Bacillus on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.3).
Install Mod
Open the mod browser in the dashboard and search for "Bacillus". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.3, 1.21.2, 1.21.1 (+1 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Bacillus server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.3). You can switch loaders with one click in the panel.
Is Bacillus compatible with fabric and neoforge?
Bacillus officially supports fabric, neoforge for Minecraft 1.21.3, 1.21.2, 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Bacillus – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Bacillus consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Similar Mods
Rent Modded Server
Install Bacillus with just one click on your server.