Any petshop that uses low levels of chemicals in their tanks needs to get their act together and stop treating unless they need to. Adding low levels of chemicals to an aquarium creates drug resistant diseases and junky fish. And that is not a joke. Fish living in tanks with low levels of medications can have serious immune/ health problems (including withdrawal symptoms) when put into clean water without medications, and they become more prone to diseases while their bodies adapt to the chemical free water. They are also more likely to become sterile and develop cancer because of the prolonged exposure to known carcinogens like formaldehyde and malachite green.he told me all the stores tanks are lightly dosed with ich x and it’s harmless to my other fish in my tank.. he recommended I give it a try. I decided to get the ich x but I only put in a half dose..
As for drug resistant diseases, there are plenty of them in fish tanks and on land, and these affect all sorts of birds, fish and animals. Medications/ chemicals should only be added to an aquarium if there is a problem. And they should be used at the appropriate dose so the disease they are treating is cured completely. Chemicals/ treatments should not be added prophylactically in an attempt to prevent diseases because it does not work.
Sorry if that sounds like me abusing them but a good petshop should not be treating any fish or tank, unless the fish are sick.
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Anyway, the medication will kill the parasites so the heat treatment is not necessary now. Heat is an option to treat Ich without chemicals. Since you have added medication, you can probably lower the temperature a couple of degrees to 28C (82F). this will make it easier on the fish.
Keep the medication in the water for 1 week and then water change it out.
The Ich X, has formaldehyde, methanol (alchohol) and malachite green in and will kill any protozoans like whitespot, costia, chilodonella & trichodina. Your fish only have whitespot, the others listed are just examples of protozoan parasites that affect fish.
*NB* Malachite green is quite toxic so wash your hands well with soapy water after working in the tank or handling the medication.
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The reason the fish get more white spots on them is because there are whitespot cysts hatching in the gravel, and these release 100s of new parasites when they do hatch. The parasites swim around the tank looking for a host to attach to and then after about a day on the fish they develop the typical white spot.
The medication or heat treatment kills the parasite during the free swimming stage before the parasites attach to a fish. However, it can take up to a week before all the parasite cysts have hatched, but usually 3-4 days depending on temperature. In warm water they develop and hatch faster so you get more parasites appearing suddenly. Then they suddenly stop appearing and the remaining white spots on the fish fall off and start dividing in the substrate. When the last cysts hatch the parasites are killed by medication or heat before they can attach to the fish and the parasite's lifecycle is broken.
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As for the graze on his noggin, just monitor that and if it goes white and fluffy it has developed fungus. If it turns red and looks inflamed, then it is bacterial. However, a healthy fish in clean water should heal up without any problems, and you have formaldehyde in the water that will kill a lot of microscopic organisms.