I have 6 moonlights in a 92 bow front tank along with a 12 inch albino giant gourami. I bought the moonlights as 1 inch juveniles and as they grew up two of the six developed a black horizontal line that runs from the gills to the tail on both sides of their body...I can't find anything online about this...they fade out and get darker at times. When I feed they get really dark then fade out to almost gone after they all calm down. I can't tell male vs. Female quite yet as they are only 3 months old. No pictures online show anything like this and it makes me wonder if the breeder cross bred with pearls or snakeskin or something. Anyone have any idea what is going on? Cause I am going crazy trying to figure it out!! I posted a pic of the whole tank too just to share with everyone and thank you for any info you guys may have!