If you're moving your fish to a new tank, there are a few things you need to do to make sure the transition is smooth and stress-free for your fish.
First, acclimate your fish to the new water conditions. This means slowly adding water from the new tank to the old tank over the course of an hour or so until the water in both tanks is equal. This will help your fish get used to any changes in pH or temperature between the two tanks.
Once the water is equalized, it's time to start transferring your fish. The best way to do this is with a net - scoop up each fish individually and place them gently in their new home. If you have plants or other decorations in your old tank that you want to move as well, now is the time to do it. Be careful not to disturbing too much of the gravel or substrate as this can release toxins into the water and harm your fish.
Finally, once all of your fish are safely in their new tank, top off the water level and add any filtration or aeration that was present in the old tank. Turn on all equipment and let it run for a few hours before adding any additional inhabitants (like snails or shrimp)to make sure everything is working properly.
With a little care and patience, moving your fish from one tank to another can be easy and stress-free - for both you and your fishes!