I wouldn’t look at just mercury only, but heavy metals in general. Chelation is a way to remove them from the body but this should only occur if your pH is neutral. If you are too acidic or alkaline, this can remove too many minerals from the body further exasperating your symptoms. My naturopath also recommends taking minerals before, during, and after chelation.
I am going to start an alkalization therapy soon and will start a chelation protocol afterwards. I also will be taking some homeopathics that will destroy the polysaccharides walls that protect the candida at the same time. Should be interesting and I should get more die-off.