I think everybody is politely glossing over the fact that nobody, including fish, is allowed to have an Upwork account until they are 18-years-old.
It is rare for fish to live that long, which is why it is almost impossible for Ramon to hire a replacement fish on Upwork.
Your 'poissons' were poisoned. Is relatively common.
We need more information. The photo is really bad and there are 31.000 species of fish but i guess that was a Trichogaster. I can be wrong, if you have a better photo post it
Those plants are not acuatic. They will die also in a few weeks. They are venomous also, but probably not the cause of the deaths here.
Don't feel bad, Ramon. I killed like 5 clown fish and a bunch of those fish that are supposed to die first... can't remember their name.
I also can't cook, don't clean (cleaning lady), and luckily have an association that fixes all those dead plants that the previous owner put there that I don't know what to do with.
It's amazing I'm capable of breathing.