only if your alkalinity is over 7.5 or so. why not get a rubbermaid or such, it is
insulated and will moderate temp fluctuations better. Ingrid

"Don" wrote:

Is a galvanized trough ok for quarantine? It is in a shady location so temp
fluctuations won't be drastic and it is very large 7' x 3'

I have an indoor 75 gallon but for koi, the more room the better. The
residents seem happy after about a week.





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