For Cute Fish, part of survival is knowing how to hide. So perhaps games of hide and seek with him will help him learn. You could teach him to hide with the help of someone else. Of course, you intend to keep him, but it's still important to know I think. It would be a nice bonding exercise, too.
They also learn to clean themselves from their parents, which involves rolling in the sand. I think those are doable goals. If you find another Cute Fish, I'm sure they would get along. Some of the other fish will probably do well with it if you're concerned about that, like a Rabbitray.
Also, I understand that it's normal for people to talk to their pets? I do encourage that so he does think his communication attempts are failing.
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They also learn to clean themselves from their parents, which involves rolling in the sand. I think those are doable goals. If you find another Cute Fish, I'm sure they would get along. Some of the other fish will probably do well with it if you're concerned about that, like a Rabbitray.
Also, I understand that it's normal for people to talk to their pets? I do encourage that so he does think his communication attempts are failing.