How many of you guys quarantine new fish for a bit before adding them to the main tank? If so, what goes in the quarantine tank and how long do you quarantine for? What are the advantages/disadvantages of doing this? I'm picking up a new red severum this weekend to replace the one that died from stress after having it for only one day. I'm considering putting it in quarantine before adding it to the main tank to avoid this and lessen the stress. Good idea or will it stress the fish even further?