Poll: How long will the big Sword plant survive with the big Goldfish

I've got a horrendous outbreak of BGA in my Goldfish tank. It's gotten so
bad it plugs the filter screens every week and now the sink drain is
plugged.

So I plucked the large Sword out of my office tank (20 G) and put in a bowl
of gravel in the GF tank. I'm hoping it's big enough to outgrow the GF
nibbling and reduce the Nitrates. It was getting way too big for the office
anyway. The first day I put it in the tank they hid in the other corner away
from the large green thing. But now they have discovered that it's covered
in Snails as they cruise through the leaves. I was informed that they did
not want their food today. No wonder, they've been eating Escargot all day.

In the past they've pretty much destroyed everything I put in the tank with
them; they either eat it or dig it up. It does not matter that they are not
supposed to like that variety of plant. I was watching them swim by the
plant tonight and they were giving me the "who us, eat your plant" look.
LOL.

We shall see.