Quick back story. I am upgrading my current reef tank to a larger new one in the next week. I will be transferring all of the rock, CUC and obviously corals. I will be using all new sand for the new tank. Current tank is about 18 months old. I have a fish that has ich. Planning on pulling the fish out when doing the transfer and putting the fish into a separate QT tank for treatment with copper power. I’ve read that the best fallow period is 77 days. Does this still hold true even if I am discarding all of the current sand and replacing it? Thanks in advance!