So long story short, i have to force four tanks to cycle fast because pond goldfish have to live in them for the time being. I have used cycle, put in decs from established tankes to transfer some bacteria. Any other suggestions on keeping pond gold fish in 20 gallon tanks? There are about four per tank right now. Its a bad situation i know, but my aunts old house was abandoned by the people who bought it, and the fish were dying, so we had to go get them.