This tank had no fish prior to the eels moving in, so I didn't bother with QT. Both eels adjusted quickly to the tank and I had no problems up till now. The platies were in QT for several weeks and I treated them with ick medication as a precaution before moving them in with the eels.
Generally, I keep the fish in QT for at least two weeks and treat twice with ick medication just to be sure they don't transfer anything with them.
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