scorpino, I understand what you are saying, I hate loosing fish exspecially when it the owners fualt, I am adding a refuge to my nano so hopefuly myn will do ok. I have read other suggestions that every week swap out refuge rocks where copepods live and it will help make sure they have food. And I also understand that I will sometimes have to supplement live copepods until I can visibly see a "big" copepod population in my refuge.