Hi new the the forum and fairly new to reefing had an ick out break in my Redsea 250 caught my 2 cardinals and treated them 2 times with super ick cure they both didn’t make it sadly woke up this morning and they both were dead and now I caught my coral beauty and the instructions are now to do a 25% water change and put filter back on and not to dose anymore but I would like to start to treat her with the medicine so should I use all new water or do the water change and just dose the medicine in !