hi guys I left my fish room for 30 min and when i returned I found 1 discus dead.these are the fish i traveled to sydney to get.
tank is
ph6.5
amm 0
nitrates 0
kh 40ppm
gh 50ppm
this fish was swimming around the tank with no signs of any problems.
when i got home from work i did 30% water change with aged water.
these fish have only been picking at there food since ive had them.
when i got back from the bush i had a ammona spike lost 4 cardinals but did a 50% water change straight away. could this be from that.

thanks cam