Biggest regret in fish keeping?

vince82 said:

For some mysterious reason when I had an office aquarium I wanted to keep neocaridinas and couldn't.. I killed a bunch.
Got a 3 gallon cube, overfiltered it, overplanted it, waited for plant to start growing healthily, tested water, bought 5 red cherry shrimp.
Acclimate the shrimp, put them in the tank, all dead in 2 hours..

..... wait 2 weeks, test the water, buy 5 red cherry shrimp.
Acclimate the shrimp, put them in the tank, all dead in 2 hours..

..... wait 2 weeks, test the water, buy 5 red cherry shrimp.
Acclimate the shrimp, put them in the tank, all dead in 2 hours..

Started becoming the office joke. Bought a betta. Betta did amazing. Wait 2 months, test the water, buy 5 red cherry shrimp.
Acclimate the shrimp, put them in the tank, all dead in 2 hours..

Betta had to live alone, was destiny.
I thought the issue could be water too soft, I bought hardness tests, dosed equilibium, thought about heavy metals or something else that wasn't tested so I tried using water conditioner, I tried using RO water, I tried using drinking water, I changed fertilizer..
It was cursed.

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