First blue diamond was around 5 months old, it was a piggy, noticed it going dark in colour and always fat, fine until one day found it floating with fungal growth on half its body, died overnight. I put it down to blockage.
Then today, fuse blew in the house and lost power to my grow - out tank for a couple of hours (was out at work), tank temp only dropped about 5/6 deg cel, found my 3 months old blue diamond dead with fungal growth on one side of body. I don't know whether it's the stress caused by the power outage or if it's connected to the death a week before, it did seem to go dark in colour this morning but otherwise nothing else wrong.
There's four more fish in the same tank but they seem fine?
I don't know what it is and not too sure what I should treat my tank with to prevent anymore losses.