It’s always bothered me that you can’t feed your fish in the Sims 4 so I’ve added a simple version of it. Every 8 hours Teen-Elder sims can feed the fish and get a 4 hour happy buff. It also gives a bit of a Responsibility boost. There is an addon for Children to feed fish as well, but it’s not currently basegame compatible and requires Eco Lifestyle.
The Sims 4 Feed Your Pets: Feedable Fish
These are overrides to the EA objects, giving them a custom tuning. It shouldn’t conflict with anything unless you have something else that happens to modify these objects specifically, but please let me know if you have any problems with it.
Credit : Ilex