I’ve been battling what seems to be a bad fungal infection in my tank. I’ve done two treatments of marycyn with some improvement. Recently added some ich x and I let it sit for seven days. I saw a video on aquarium co op recommending adding Marycyn and ich x for 5 days. Would I have to do 25% water changes each day or just keep adding the ich x and marycyn for the 5 days