One Fish

We have the weirdish fish! Sparkles, spends all day with half her head out of the water. At first, I thought it was dead, but this has become it's favorite place to hang out all day. I thought a fish needed to be completely in the water. Only when I feed it does it go all into the water, otherwise it does this...
It has found a comfy spot to rest, I wonder what would happen if I took the plant out. Do I have a lazy fish?