I agree with the above posts. Without knowing why your fish died in the first place, you stand a high chance of repeating the process and creating another "tank of death" even though I'm sure it's not your intention. Don't worry, lots of people make mistakes with their fish tanks (myself included) and we're here to help.
Is this the same tank where the cory with swimbladder problems died? Even if it's not, it seems like your tanks are having issues. Give us some details and we'll try to help you sort it out
I hate to take a pause and get off the thread topic for a moment but its worth mentioning..........if we had more posts like this with a helpful, nonjudgmental tone that expresses a supportive attitude and a willingness to help there would be a lot less conflict on the site. Kudos to you bro :dance: