A Riddle

It is an animal.

It is small.
It has got four legs and two eyes.
It is green.

It likes the fish.
It doesn't like the lollipop.
It can swim very well.
It can walk but it can't run.
It eats small shrims.
It is intelligent.
It has got its house on the back.
It is adomestic animal .
It is in a fishbowl.
It is in my blog.
What animal is it?