In that case, after 6-7 hours start running carbon, change it every 24 hours. After the 6-7 hours do a 50% water change, then do 2-3 more 25% water changes over the next 3-5 days. That should get your corals squeaky clean and happy Without the crab & pod die-off in the QT, the water changes probably are not as critical as keeping fresh carbon running to get the medication out of the water.