"Mel" wrote in message
k...
The very first thing to do is to check your water quality. What are your
ammonia, nitrite , nitrate and PH levels?

Haven't a clue. However, I use a recommended product called "aquasafe* ,
everytime I change water in the tank &
in the 18 months that we've had the fish/tank we've had no other
*casualties*. It's a 4 foot tank, with 2
pumps (either end ) running.



Also what size tank are the fish in? Should be pretty big if you have 15
goldfish in it!