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i recently used my heater in my 29 gallon QT and was wonderinghow can i clean it and put it back into my DT because i used copper.... if possible please let me know what to do thanks!
I certainly wouldn't risk it..... You never know what kind of trace may remain. General rule of thumb is to keep items used in a QT/hospital tank away from your DT, period.
I don't know about your tank, but everything in mine is worth far more than trying to save a couple $$ by using a possibly contaminated heater..... go get yourself another one.