In answer to those questions posted above;
The only tank that has multiple Porks is the 125 with the pair of Porks I have had since 94. The two get along well except at feeding time when they will push each other and steal food from each others mouths. The Female has a forked rear fin due to the male nipping at it when they were youngsters. The other 3 are in different tanks with different fish buddies (the 2 babies; stars and stripes, and new Porkster! The big Dogface lives alone as it has eaten anything I tried to put with it).
When I move my Puffs I use a container to scoop them out of their tank, then since I trust my tanks better then a lfs I place the container in the new tank tip it and as soon as the Puffer goes out remove it and dump whateve water is in it. When I buy new ones the lfs guy does use a net to get them but he is fast and has them in water before they know what happened. In that case when I am ready to put them in my tank I pour as much water out as I can and just let the Puffer slide into the tank. For the big Porks to move them (as when their tank leaked) I used a 2 gallon bucket to get them. For the small ones I use a small clear critter container I bought for transporting new fish home.
I have learned a few tricks over the years such as I have 3 different size critter containers, and 2 different buckets that I use when I buy new fish. I have the store put the fish in my container instead of a
bag. I find it easier to then drip the fish when I get home and since the furthest store I deal with is about 20 minutes away I have no O2 problems getting them home.