How do I distract the Blind Batfish?

Hint 1 of 5:

Place something useless

Hint 2 of 5:

on the grassy ledge

Hint 3 of 5:

to the right of the batfish.

Hint 4 of 5:

Now rummage around in the cave.

Hint 5 of 5:

You are looking for items you can sell later