So after adding a certain amount of fish to your tank, and then you want to add more, but you are wondering if you will mess with "balance" of the community, this is the answer. Especially if you are like me, and are adding lots of similar conspecific fish like wrasses. This particular box came from Elite Aquatics, and is very nicely made. When you order, you specify if you have a rimless, euro braced, or plastic rimmed tank, in order to hang the box inside the tank. A lot of the boxes out there come with suction cups, which can be a pain. This one has a hinged lid and a nice bracket to hang on the tank. I received mine yesterday, and was able to put it to immediate use. I was adding another wrasse, and everybody in the tank got to come up, flare and flash their size, and basically just check him out. This afternoon I let him go, and he felt no need to hide, and everyone just acted like he had been in there the whole time. Very cool product IMO, and keeps the fishies stress free.
Acclimation boxes
Acclimation boxes