Answer:
The statement that best identifies the theme of "Love song, with two goldfish" is love is difficult to sustain and often fades away.
Step-by-step explanation:
In the poem "Love song, with two goldfish" by Grace Chua, the central theme is that love is hard to sustain and that often fades away. We can see that the author is implying how loves fade away when she says,
"(But her love's since
gone belly-up. His heart sinks
like a fish..."
Indicating that the female fish does not love the male one anymore, it went belly-up. That is to say, her love for him died.
In the previous lines, we can see that they were both in love. For example, when the author writes,
"(He's a drifter,
always
floating around her has
nowhere else to go..."
The male is always around the female, trying to gain her attention. Until she does it, and they are both in love.
"(Bounded by round walls
she makes fish eyes
and kissy lips at him..."
In conclusion, even though they were in love, this one was hard to sustain, which we can see in the female goldfish that does not love her partner anymore.