AbbeysDad
Fish Gatherer
Assuming the water is dechlorinated, the right temperature, etc. they can go back anytime. On the other hand, if you changed to sand that maybe wasn't well washed enough, you might wait a few more hours. But depending on where your fish are presently (like a bucket), they might be better off in the tank....
How long would you say to let things settle before i return the fish back into the tank? Cheers