I'm going to try setting my 75 back up soon. I'll be using pool filter sand, I got rid of all my gravel. What I am trying to figure out is how many convicts to use to cycle the tank with. If convicts aren't good, I won't use them, but I did want to keep some convicts as natural feeders. I have 2 Emperor 400's on the tank, but I was an idiot and forgot to put the bio wheels in some water to preserve the bacteria. I might get some NiteOut to speed the process up. I thought at least 4 convicts to get the proess started. What do you think?