What is killing my fish?

  • We are currently upgrading MFK. thanks! -neo
You didn't cycle the tank. It takes weeks, not days.

I would do a 100% water change.
Add one of the bacterial agents as described above, follow the directions.

Add one or two small fish and wait a month, add more fish a week or so apart.

I would also recommend quarantining, but it doesn't sound like you are set up for that, so you have to roll the dice.

I cycled three tanks this way, from 30g to 150 g, all with the same three fish. Never lost one.




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