External parasites-discus fish disease

External parasites come in many types and I am unsure of exact species. However, I have found by symptoms, that there are differences and different medications are required. Basically I have two main medications for use for external parasites.

Jungle Labs 
Jungle Labs Parasite clear which I use for fish that are scratching themselves on objects in the tank. I believe this to be skin fluke and use this drug for anything I feel requires mild treatment. Dosage is one tablet for every 40 litres of tank water, repeating two weeks thereafter.

Gill fluke
Gill fluke is a common disease in Discus and is worth mentioning separately to other external parasites. In adult Discus, it is usually associated with heavy breathing, however, in fry it causes much greater problems.

Discus with diagnosed gill flukes

When young Discus get to around 10 cent piece size, gill fluke may become a problem. The parents carry gill flukes in small amounts all the time and if the parents are left with the babies too long, after free-swimming, then the parents can pass them on to the babies. The classic symptoms are heavy breathing, and erratic swimming as though the fish has been bitten on the gill by something inside. This can be accompanied by a spasm and sudden paralysis resulting in the fish sinking motionless to the bottom. This condition seems to be brought on by overcrowding and high feeding rates associated with raising the fry, and can be avoided sometimes by spreading the fry out as they grow.

Gills with gill flukes, microscope photo

image souce from : http://www.jbl.de