Hi crew, hope all is well. I recently (Thursday) added 2 Corydoras Schwartz’s to the 3 I already had in my 20 gallon freshwater tank. They came from the same small LFS and I was told they were the last of the group the first 3 came from, so I added them to the same tank (I know my first bad move). I have had the others for over a month with no issues although I lost one the day after, but I truly think I was just inexperienced and did not acclimated correctly. So now I have 5 and they have been acting so cute, shoaling and everything! Last night I noticed a white looking area on one Cory’s head which runs down behind the ‘mask’ to form a V when you look down from above. Actually a couple of them seems to have a ‘V’, but only one has the area on top as well. I am not sure at all if this is normal markings, as I don’t remember it from before. I watch them every day and ni