Hello!
Be carefull with fungal infections !!!
That is one of the most causes of death for snakeheads!!!
It is very important to heve clean water then!
I alway seperate the fish into a smaller box ,with about 10 litres of content!
I only use reversal osmosis water then.........mixed with a tiny little bit of tab water!
Use almond leafs !
keep the fish darker,so it might calm down!
I put always a piece of pvc pipe into the pox where the fish can hide!
do not feed it at the beginning of the treatment........
Some medicaments you can buy in a petshop might not work!
a antibotic medicament would be fine also!
first a crash course with antibiotic an then the thing with the leafs!
Good luck!
Pascal