Malachite Green can harm the filter bacteria and kill it its not the best medicine out there all tho it is very strong if i was going to treat with Malachite Green do it as a dip get a bucket make it up as you would the ratio it says on it use tank water and put your fish in for about 10 seconds but white spot is a parasite and will come of the fish and multiply and come back with force ive They usually disappear on there own but last several days the fish seem healthy and are eating well. Oscar fish that develop a fungal infection have a growth on the skin that looks similar to a tuft of cotton.

The patches are about the size of a pea or so and usually flat but one was a bit furry a few days ago.

Oscar fish Main details - 450 litre tank 2 oscars about 9 or 10 inches long 2 plecs they don t get the white patches ammonia 0 ppm nitrite 0 ppm The color starts off white but as the infection worsens it can change to gray brown or red. Infections occur on the skin fins or mouth. Your fish may appear to be depressed and lose its appetite. He has white spot white spot will eventually kill the fish it attaches to if not treated. You can go to any aquarium specialist most pet shops and thay can give you treatment.

It is contagious so if one fish has it they may all get it so treat the entire tank not just the single fish And follow the instructions. Oscar fish diseases can be a real threat to one effort to rear this wonderful fish species. There are many diseases that affect oscar fish most of which varying symptoms and pose a varying threat to the helath in a home acquarium. Hole in the head hith oscar fish disease hith is a deadly oscar It has likely been feeding on the body fluid of the fish for several days and has swelled to many times its original size.

At common aquarium temperatures of 75 to 80 f this feeding stage lasts only a few days at which point the fully developed cyst drops off the fish as a tomont.