Malachite green is a dye and is good for curing parasites like white spot. I understand that malifix is teatree oil and is good for oiling teatrees. You should pick the most apropriate treatment and use that on its own. If you mix treatments you can end up with a toxic soup. The usual treatments for white spot would be malachite green, copper ion (chelated copper sulphate), quinine, mepacrine. Some fish are not tolerant of the first 2, and the last 2 don't knock the plant about. Others are used as well. Wunder tonic contains a mixture of some of the above but best not to mix unless you know what you are doing. Others will nno doubt have there own favourites.