new fish in QT, duration?


New member
I have 3 new fish in a 30 gallon QT(the water came from the display tank) and they are all eating and acting fine. They all look healthy and normal. I know 3 weeks is the standard but I don't want to lose any to ammonia build up or stress of a small tank, they will be going in a 150g. I planned on changing 5 gallons of water every 2-3 days. Does this seem like a good plan?

How long do you guys usually quarantine new fish and how long after they begin acting normal do you leave them in the QT?


ReefKeeping Mag staff
Premium Member
The water from the display tank will not do much to help establish a biofilter. Watch your ammonia.Seeded rock or some sponge or filter material will. I qt for 4 weeks.


In Memoriam
It depends on the fish. I QT'd my tang for 4 weeks, my mandarin for 2 days. Delicate fish don't do very well in QT. Butterflies would fall into that category also.