Carnivore frog and fish don't live well togehter

My brother's aquarium some time ago: a carnivore frog and fish of different species, sizes and colours.
My brother's aquarium now: a carnivore frog, two big fish and a third one hiding in the leaves.

Here's what happened in between:




What also happened, is that Bro brought worms for the frog. A month ago. Unfortunately, he lost them somewhere and they only have been found today. In the car. Imagine the smell.

In the meantime, the poor hungry animal ate half the aquarium.