I would stave them for 3-4 days before shipping as they seam to crap bad in the box
To tell the truth I wouldn't risk shipping anything over 16inch by air as the risk of death longer than 4 hours in transit is high
If you are moving the fish your self then put it directly in the poly box with as much water as you can and have another polybox full of spare water and think about changing it after 4 hours if the trip is longer
What you could also do is float a bag of carbon in the box to get rid of some of the toxins
I shipped four 14inch ST from Singapore one was DOA one was near death but just pull around after 4 weeks it started feeding again the other 2 were fine
I also shipped 2 ST myself for only 4 hours one was fine the other died 6 hours later
It's a big gamble shipping anything above 16inch
I hope the move goes well
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