I'm typing this on an iPod right now, So I can't put up pics, but I can describe in full what happened. To start things off, my brother had three comet goldfish that had grown quite large in a 10gallon tank(I know that's a lot, but that's nt the problem) three longfinned zebra danios, and a mystery snail. Now, yesterday he went to petsmart and bought three neon tetras, two more snails, new gravel, new oraments and a new plant. He didn't wash the gravel, or the plant. He had just replaced all the water in the tank and everyhing seemed fine. Then his three tetras died. Did I mention that he also added four lake minnows from our lake house, two of which died, then he moved them withoit permission to my betta's tank? Anyway, the three tetras died, he was bummed, but everything was still okay at the time. This morning we awoke to the horror of the video game "dead space" in fish tank form. The water was cloudy as milk, dead fish floated along the top, stuck to the filter, or sat at the bottom gasping. I have pictures, but I'm on an iPod and can't upload them just yet. The fish have this white fungus-like crap all over the dead and the only live commet gold. Their eyes are cloudy, it's just plain sickening...Really not sure what happened, but any advice would be helpful. I HATE PETSMART!!!!!!!!!!!!