I've had them on n 3 tanks.all 3 have had oxygen I'm pretty sure and only the current tank has cover but they've been doing it since I got them two years ago.could it be that because I've grown them out in a tank with only them where they've felt safe at the surface and when I got other fish with them and got them a larger tank they either still feel safe doing it or forgotten that it could be potentially dangerous?
No one in the my area has seen them surface except when they have to take a breath.
Not ungrateful though. I'd never considered those.I'm not home for the next few weeks but when I get home I'll post a picture of my tank.
Always for more suggestions
Thanks
Nice user name lol
They could just be secure and comfortable in there environment. I have a few wc that are really active and always on the move. Also have an ornate that likes to perch high up in the tank.