Eric,
The goldfish tend to be in the 5-11 inch range. She has a few that are about 8 yrs old and fairly large for such a small puddle. I am sure most of them would not be an issue for YP eating right away. They have spawned many times and as such do eat their own. Thus the Fatheads I am sure could have some pressure on them from the goldfish but not much. Thats why I was thinking of something else. My sister is not really interested in BG, but if a case can be made she might consider it.