I came home today from a long and rough day at work (around 10pm) and found one of my clownfish dead and sucked against the vortech, bellus angel dissapeared, and my old clownfish covered with a white fuzz. This morning they looked great, they've been great forever. My shrimp is still alive, logs show no spike or drop in temp, params check out, all snails still alive (miraculously)... I'm so sad. I'm mixing water now to do a huge water change. I'm thinking of using a rock from my frag tank and dropping it into a bucket and putting my last fish in there to see if that will help, though that might be more stressful. If she dies I'm done with this for awhile. I keep up with regular maintenance, but I think the tank needs more than just weekly water changes... can't do it.