Hi Barb, welcome to Fish Lore

If you could fill in your aquarium info (at the top under My Settings) it will help the members help you.
I'm really sorry about your fish.
What size tank do you have?
When did you start it?
How many and what kind of fish do you have?
Is it cycled? How did you cycle it?
What are the readings for ammonia, nitrite and nitrate?
What kind of test kit are you using?
What's the temp. of the water?
Do the fish shw any symptoms before they die?
Sorry for all the questions, the answers will help us help you
