I am a fish

I am a fish in Crystal's fish tank... I live in her laptop...
I have a light green body and dark green fins... and tail...
I swim backwards...
I turn pink and yellow when I am hungry...

Izyan is a singing fish in Crystal's fish tank... She sings...

Peiling is also a fish... But she just got promoted... She is a different fish now...

I want to be promoted too... I dun like to swim backwards...