Please do not test if your phone is waterproof by putting it in a fish tank! Use this (safe and water-free) method instead:

https://techjeep.com/2015/03/08/how-to-t...

There is this very clever (safe) trick to test: https://techjeep.com/2015/03/08/how-to-t...

Sorry to say this, but: this is THE worst method to test if your phone is waterproof! Check this (safe!) method:

https://techjeep.com/2015/03/08/how-to-t...