Oh, no its not, ive been treating with Para Guard, it has that Malachite green in it. A few fish died the first week, clown loachs, catfish, and a rummy nose tetra, but nothing has died in about 5 days, but it will not go away on that Angel.
The malachite green can be harsh on fish. I have luckily only had to use it once...but the salt heat cure seems to work very well and is not so harsh on the fish IME.
I know its harsh, i believe the treatment is responsible for my catfish death, but i started with the salt/heat treatment and and ran out of salt, 120 gal... its cheaper to treat it like this but you can bet when its cured I will be stocked on salt.