From looking at your list I assume you tried to move your paroon sharks from the 20 to the 35 gallon tank? I have made a mistake of putting a catfish in with a pacu that was too big for it to handle. I put a baby 3" tsn in the tank with a 6" pacu, and woke up about 3 days later to watch them in the rising sun to see the shock and horror of the pacu biting through the head of the tsn. I still wish to keep pacu myself and have kept them in the past with no problem, but they grow so massive so quickly that I am going to wait till all my catfish are large enough to be able to handle such a brute, then raise one from a baby. As for the ich raise the temps do lots of water changes. When any of my fish get it which is rare these days I do daily water changes, and it seems to clear up in about a week.