Seachem Flourite grave Killing my fish?

[JoeA]

Hi, I started up a small planted tank for my office with several plants. It's a 8 gallon cube. I have a small HOB filter and a filter with a heater. I used Seachem Flourite gravel and I believe I rinsed it well but my fish died. I used city water and put Seachem prime in the water to condition it. I used a Tetra easy strips to test the water and it's not showing anything bad. The feeder goldfish lasted a day.

Thoughts?

 

[Aiken Drum]

Did you cycle the tank?

 

[JoeA]

It is a new tank, I was using the feeder fish to cycle the tank. It is not a cycled tank. I want to use live bacteria but wanted to let the fish create some ammonia first.

 

[Aiken Drum]

Fish dying in a day is usually either an already sick fish, chlorine (ie no conditioner), lack of oxygen (shouldnt be an issue with a HoB), or not acclaimatising a fish to the new water parameters you are introducing it too.

Personally, dont use fish to cycle a tank you dont intend to keep.