I'm a newbie on this site. My box fish apparently died while I was on vacation. I had someone feeding him. The only thing I can think of is the smell from the hard wood floor refinishing got to him. Any way, he killed the other 4 fish in the 50 gallon tank. How do I get the poison out of the tank? I removed the live rock and put them in fresh salt water. I removed half the water. I had just cleaned and replaced the filter with clean carbon BEFORE the deaths and it is still running with 25 gallons in it. Obviously, I removed the bodies I could find. The crabs got the rest. How do I remove the poison before I put in more fish? Please help. Frustrated in Denver. Thank you.