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Re: Molly fish has had ick for almost a month, done everything, wont go away.

Subject: Re: Molly fish has had ick for almost a month, done everything, wont go away.
by Fishlady on 2019/8/16 12:08:47

How did you cycle the tank? If you didn't do a full fishless cycle (see this link https://www.fishkeeping.co.uk/articles ... hless-cycling-article.htm ) then your fish have been exposed to ammonia and nitrite which will have weakened them and thus allowed the ich to take hold.

It also sounds like the treatment used is or contains methylene blue which will kill the "good" bacteria in a cycled tank and once again expose the fish to ammonia and nitrite which may explain the stubborn infection in that one fish (he may be weaker than the others).

You need to check whether your filter is fully cycled by testing the water for ammonia, nitrite and nitrate. If you don't have a test kit you need to get one, liquid-based (not paper strips) a.s.a.p. to test the water with. The API Master Test Kit contains all the essentials. Test the pH too, as guppies and especially mollies need to be in hard alkaline water to thrive. Ich is common in mollies kept in soft water.

To treat the ich effectively, do a large water change, put the temperature back to normal and treat with Esha Exit.