Tried to do a search for this, but it doesn't look like it's working, so I'm sorry if this has been posted previously. Just wondering how many of you use a quarantine tank when introducing new stock to your established tank? I've read a lot of material (books, online) that highly recommend this step. I'm going to set one up, it just makes sense to me. Has mutiple uses, quarantine, sick fish, etc. Of those that do use one, do you keep it pretty simple? Do you have substrate in it or just a couple of pieces of pvc pipe on the bare bottom? Any comments, suggestions would be appreciated. Thanks.