My new cichla (only a few days of having it) has an expanding lesion close to its vent and anal fin. I have no idea what it is. It seemed like a minor abrasion at first but it is now expanding across the underside all the way to the other side of the fish. The ph is a little above 7.5 and the hardness is 165mg/l of CaCO3. The lesion looks like this http://i348.photobucket.com/albums/q350/CichlidDan/IMG_1977.jpg What is it and what should I do to treat it. Please disregard my replies to my id thread as this pretty much sums it up.