Aquarium fish feeder quantity reducer

If you have this kind of popular fish food dispenser, https://www.amazon.fr/dp/B074FSPMXM, the two options to adjust the quantities might still be too much for a small tank.

This set of replacement inserts reduce the opening to dispense much less food.

You can customize the hole dimensions, to adjust the food quantity to your fish tank population, and you can choose how many different openings you want to test, and how many sets.

I printed some of these for a friend who has 7 of those dispensers.