I don't have any plants with the goldfish, but I had a hornwort in the Qtank
when I put in one of the gf. She ripped it up in seconds. But I think
there were probably baby snails in the plant since the tank it came from is
full of them.

What about Java Fern? I see it mentioned all the time. I also have
Ludwigia, but, again, not with the gf. I don't think they'd bother with it
since the snails don't bother it.

Word of advice... soak your plants in salt water and rinse well before
putting in the tank. This kills the snails. Someone else can advise you
better on this, but, believe me, they are a pain, and multiply like you
wouldn't believe!

Tammy