Anyone ever experience a fish change its personality and/or behavior for no reason, but still seems healthy? I just got a Clown Knife back in February and after a week, it started to recognize me as its food source. So it would come up and out of its space to the top corner where I would drop one pellet at a time until it decides it's had enough and would swim away. It's been like this for over 3 months. For the past couple of weeks now, it never comes up and out as before. Looks healthy, water parameters are normal 
( pH 7.8, Ammonia 0, Nitrite 0 Nitrate 5), but the last feeding before it started acting like this was when I decided to treat it to fresh cut Tilapia. That was the only change.
So I didn't feed it for a couple of days just to entice it to come out, but nothing. I would drop pellets into the tank and it would be gone by the next day, so I'm assuming it's eating. Not thinning and it doesn't seem to have any visible damage and/or disease.
( pH 7.8, Ammonia 0, Nitrite 0 Nitrate 5), but the last feeding before it started acting like this was when I decided to treat it to fresh cut Tilapia. That was the only change. So I didn't feed it for a couple of days just to entice it to come out, but nothing. I would drop pellets into the tank and it would be gone by the next day, so I'm assuming it's eating. Not thinning and it doesn't seem to have any visible damage and/or disease.
