Nice, keep the updates coming. Massive tank and plenty of room, looks very healthy. Imagine that fish in 10 years in that tank, completely different looking fish. I've seen multiple spawning pairs in a massive public aquarium (Chattanooga TN). IMO most Dovii aggression is not having enough space in a typical tank. They need lots of room and a 15 year old Dovii is so different than a 5 year old in a 300 gallon.