Oof… i know the feeling, i took a long break from summoning after multiple failures during last summer’s banners as well. I’m taking this as the game trying to make up for those losses. Maybe you’ll get maximally lucky for CYL7

Its requiring the app to read the article

Ah ok, so the tank wasn’t cycled then. Cycling is essentially getting beneficial bacteria to start living in your tank and reducing the waste chemicals produced by aquatic life to a less harmful chemical (nitrogen cycle). Essentially the idea is you’d continuously introduce some sort of ammonia into the tank and monitor the water until it drops to 0.

This seems to be a good article to get started: https://www.freshwatersystems.com/blogs/blog/how-to-cycle-a-fish-tank

I’m sorry for the loss of your fish though. Aquariums can have a bit of a learning curve and we have all made mistakes. I hope this’ll be a sad but good learning experience and that you’ll continue to explore this hobby!

Would you be able to explain what you did to cycle the tank?

Usually one week isn’t long enough to fully cycle a tank, especially since it seems as if it went from 0 life to basically fully stocked overnight. I’m guessing if the tank was cycled, it was cycled for a much smaller load of fish/life and the larger introduction shocked the system and the ammonia is too high.