Hello everyone, i have a serious problem with my Discus, the look fine and act normal, until they develop one or two white pimples on the side of their head and about two days later, they turn into large Craters, the fish will eventually die in within 10 days.
I have all the water parameters correct, and many other fish do well in the same tank.
I tried three different Antibiotics, and salt but nothing works, i lost 4 like this and i have another 4 that are starting to develop the same thing.
What is this thing, the fish breathe normally and look hungry all the time.
Thank you.
Mat. :'( :'( :'(