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In my two years of fish keeping, I've encounter ich (came with the fish), gill fluke (came with the fish), mouth rot (came with the fish).
It is most important to use a quarantine tank for new fish before adding them into the existing aquariums. No disease will just come out of no where. There is always a source, and they usually come with already infected new fish you just bought.
I would not recommend to use any medication for ich though. Heat treatment alone cured my fish in less than two weeks. All I did was simply raise the water temperature to 86F slowly. Most ich dislike high temperature and they will just die eventually.
Some medications did more harm than good for me, and I am not going into that part lol. Terrible memory.
For mouth rot, I spent so much money on getting the poor Neon Rainbowfish cured. Took me months to get them healthy again. It was horrible to see their mouth rot away, not my fault though since they came with it. I only blame myself for not seeing that before I bought them from Pet Supplies Plus (dirty water, terrible lighting, so I couldn't see it until I set them in my quarantine tank).
My advice is, it is best not to use medication on the first sign of problem. Some of the problems can be fixed without the use of medications. Medicates all have side effects, sometimes they can ... kill the fish. <--- Speak from the experience !
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