Hi guys so I have successfully appear to have treated my fish for white spot! I have not put the filter back in the tank as of yet as the last treatment was only yesterday (it has been out a week) this morning however I noticed a lump on my gourami that is swollen and looks very similar to a purple bruise it's on the side of his body! He appears ok ate well and is swimming fine! Any ideas as to what this could be and how to treat? I am new to keeping fish and I appear to be having one problem after another x