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I have a 60 gallon tank with about 10 goldfish. It is well filtered and clean. Recently I added a pleco who died within a few days. After that all the goldfish got sick. They seem fine but then suddenly their mouth and gills stick wide open and they start vibrating wildly like they are having...

Several reasons are possible. One is that goldfish are messy fish and usually need about 10 gallons per fish to keep from getting it messy. Another problem could be overfeeding, goldfish act very hungry so people have a tendency to give them alot of food which breaks down and makes the water...