If the main tank looks ok and the problem is in the sump, I would leave the sump off line for a while as to not contaminate the main tank. I would do a 100% water change in the sump before I started it back up.
Thats sheety Christy..Im getting worried about my tank swap. I think Im going to set up the new tank and let it run ( as best as it can run with cobbled up parts and pieces and borrowed rock from my other tanks) for a while before I switch the contents.
