Japanese crossword «Fish in the Bathtub»

Now one weary day, I woke, my alarm said, "Boss time's up"
Filled my bath up with the water, gargled with my gargle cup
As I bathed, I felt a presence, and I'm sort of ticklish
I looked down and then around and I heard
"Hi, I'm Mr. Fish, how do you do? As for me
I'm in tip-top shape today, 'cause my water's clean
And no one's mean, says Fresh Fish Filet
See I look past all my worries, which is something you must do
Though you're fed up, throw your head up
With this advice from me to you
And that's to tread water"