It could be from aggression, illness or water quality issues.
I see no need to change all the water out without testing the parameters first. Do you have readings for your ammonia, nitrite, nitrate and ph levels?
How often do you do tank maintanence on this tank?
What size tank is it?
What are the inhabitants?
Do you have adequate filtration and water circulation on the tank?
Was the fish holding eggs/fry at the time of death?
Kim
I see no need to change all the water out without testing the parameters first. Do you have readings for your ammonia, nitrite, nitrate and ph levels?
How often do you do tank maintanence on this tank?
What size tank is it?
What are the inhabitants?
Do you have adequate filtration and water circulation on the tank?
Was the fish holding eggs/fry at the time of death?
Kim
