Hi all, I have 2 Northern long-necked turtles, they are 11 months old and their carapace lengths are both about 7cm. In the last 3 months I have noticed some black spots appear on one turtle which are now on both turtles, I have added photos of both turtles while dry docking with their shells covered in Betadine and also them in their tank. Their tank is 4x2x2 Water chemistry; pH - 8.0 Ammonia - 0 Nitrite - 0 Nitrate - 0 KH - 80-100 GH - 200 Pure sea salt - 3-4ppt I use a mercury vapour 120W for their basking light, a 4ft NEC black light and 2X 2ft Exo-Terra 10.0 UVA/UVB fluoros. The long-necks don't use their dock to bask as the water temperature is at 30° and sometimes climbing to 32° which I cannot lower as I live in Darwin. I want to aim for 26°C. I currently have them outside and try to do this 4 days a week at least, to dry out and catch extra UVB. They are fed 3 times per week a small amount. Their diet is as varied as possible and consists of shrimp, small fish, small snails, crickets, woodies, flies, occasional pellets (Exo-Terra), and I make cubes of insects blended up with Wombaroo and gelatin to make a solid cube which I freeze and use when needed. They are taken out of the tank and put in a separate feeding container to feed as to not leave any leftovers in tank. As I'm worried this could turn into shell rot from the inside, I need to find the quickest way to fix this problem and also prevent future cases. Thanks, Grant.