Modpack version
0.5.6
Describe the bug
Thrashers from Upgrade Aquatic spawn in huge batches and wipe out all the fish in the area, increasing the entity count dramatically. While attempting to spawn more entities, it spams the console with the warning: "[Server] Server thread/WARN [minecraft/ServerWorld]: Tried to add entity upgrade_aquatic:thrasher but it was marked as removed already"

Logs
N/A

Screenshots

Thanks for the report, I've decreased the weight from 90 to 30.