Dr.Seuss Moves On

Old fish, new fish,
Sometimes blue fish,
This one is passive-agress-fish,
Makes you think it wants to stay,
But nips your heels anyway,
No, no!
This will never do fish!
No need to even think this through fish.
I don’t want that sort of play fish,
So I’m sending you awayish,
Sorry if it makes you bluish,
But out with old fish,
In with new fish.