How do I get the fish farm to work? Makes no sense to me.

Fixed on 1.8.136, update it.
(!) Attention: need rebuild all fish buildings for its working!

Awesome. Unfortunately I found another bug trying to test this.

The mod Food Industry (2.0 beta) (1.8.136) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FoodIndustry::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
FoodIndustry/prototypes/scripts/trees_control.lua:93: in function 'v'
FoodIndustry/control.lua:110: in function <FoodIndustry/control.lua:107>
stack traceback:
[C]: in function 'index'
__FoodIndustry/prototypes/scripts/trees_control.lua:93: in function 'v'
FoodIndustry/control.lua:110: in function <FoodIndustry/control.lua:107>

LuaEntity was invalid

Which item do you place? Or what do you do that causes such an error?

I placed Wheat down, and it kept showing a message "got wheat seed" during each step until it crashed.

Think it might be related to a K2 or SE update.

Modlist:

base
aai-industry
aai-programmable-structures
aai-programmable-vehicles
aai-signal-transmission
aai-signals
aai-vehicles-chaingunner
aai-vehicles-flame-tank
aai-vehicles-flame-tumbler
aai-vehicles-hauler
aai-vehicles-laser-tank
aai-vehicles-miner
aai-vehicles-warden
aai-zones
alien-biomes
angelsaddons-warehouses
artefact
Automatic_Coupling_System
bigtruck
Bioluminescence
bobclasses
bobinserters
boblibrary
bullet-trails
cargo-ships
Coke
Construction_Drones
Crawler
CW-orbital-solar-power
CW-tesseract
Dectorio
DragonIndustries
EditorExtensions
Environmental_Science
eve-weaponry
even-distribution
factoryplanner
Fill4Me
flib
FoodIndustry
grappling-gun
HelicopterRevival
IncendiaryMunitions
informatron
jetpack
k2se-compatibility
Krastorio2
LJD_Vehicles_A16
LSlib
miniloader
minime
Mining_Drones
MIRV
MultipleUnitTrainControl
MushroomCloud
oil-hauler
OrbitalIonCannon
Oxygen2_0
PickerAtheneum
PickerBeltTools
PickerBlueprinter
PickerDollies
PickerEquipmentKeys
PickerExtended
PickerInventoryTools
PickerPipeTools
PickerVehicles
platforms
Powered_Entities
QueueToFrontNG
railloader
RaiLuaLib
RealisticUranium
RecipeBook
regenerate-terrain
Robot256Lib
robotarmy
robot_attrition
Rocket-Silo-Construction
RPGsystem
SantasNixieTubeDisplay
SchallAmmoTurrets
SchallArtillery
SchallGeowarfare
SchallGunPod
SchallLandMine
SchallMissileCommand
SchallPickupTower
SchallPrimaryBattery
SchallRechargingWeapon
SchallSuit
SchallTankPlatoon
SchallTransportGroup
selfsealingstembolts
Soundpack-alerts-and-sirens
space-exploration
space-exploration-graphics
space-exploration-postprocess
stdlib
StoneWaterWell
textplates
Todo-List
Total_Automization
Tow_Tank
train-pubsub
trainConstructionSite
Transport_Drones
Unit_Control
VPE
Warehousing
windturbines
Wood_Gasification

LuaEntity was invalid.
FoodIndustry/prototypes/scripts/trees_control.lua:93: in function 'v'

It seems to be fixed in 1.8.139. Test it.

Seems to be working. I'll keep playing to check errors and balancing. Cheers.