I have had the fish for a few weeks now and everything seems to be going well. This morning I noticed a very thin line on the outer edge of his gill shield, not sure on terminology, seems to be really dark almost black. He is extremely active and when he is flared his gills are nice and pink colored. I also noticed that a couple of darker lines on his fins but when I put a mirror against his aquarium and he flared these and the lines were actually a rich purple color which is part of his coloring. I do a 50% water change around every 4 days and the aquarium is filtered. As far as feeding we rotate 2 different pellets twice a day and once maybe twice a week rehydrated freeze-dried bloodworms. Tried to feed frozen plankton with no luck and yes it was thawed and actually removed them and cut them into smaller pieces they seemed a little large for him. We had one green algae outbreak which I changed approximately >90% of the water replaced with treated water and cleaned the filter with separate treated water. The algae problem seemed to manifest itself within an hour or two and the above was performed when noticed.
Was wondering about the gill shield? I can get long winded at times.
Tried to take pic of the line no luck.