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Help!!! Recently, I have been having problems with fin rot in my coldwater fish tank. Upon finding this out, I immediately added medication and it appeared to be clearing up. I then took a trip for three days, and returned to find one of my goldfish with two patches of missing scales, one on each side of it in the middle portion of its body. The fish's feces are very stringy, clear, and thin. It appears a bit woobly and does not appear as active as normal. I have no idea what this could be. If anyone has any answers, please reply with your diagnosis and treatment of this ailment. I don't know how fast this will progress, so please reply ASAP.

With stringy clear poo it sound like internal paracites.How big is the tank and how many fish do you have?How often do you vacuum?How much water do you change?What`s the ammonia,nitrate and nitrite reading?

What size aquarium are they in?