Hi, I hope I have posted this in the right place. I have quite a large tank with a baby fantail and a baby black moor. It is mature - I have had them for about 7 months.
When we first got the Black Moor we thought maybe he was blind or had sight problems because he often bumped into things and couldn't see food like the other fish could. He seemed to rely on smell to eat. He spends a lot of time on his own, in open water just floating with the current or just floating in the cave. Today he is face down against a plant pot. I have attached a video of him. I don't know if he is just a bit strange and lacks drive to actually swim - he eats fine and can swim when he wants to, but just seems very lethargic. Sometimes he tips upside down and floats like this before correcting himself. I've also seen him tip upside down when he gets excited about food. He looks healthy but in the video maybe someone will spot something?
These are my water paramaters:
Nitrate 25mg/l (The tank is due a water change)