Bright
A good moon is a bright moon. Not just in terms of light, but in mood as well. Like, gee wiz, what a bright, happy moon.
Picture the good, good bright moon. Shining and shimmering and smiling down at us on Earth.
ろう
ほが
None
It's so bright that you can see all the roe (ろう) in the sea glowing and reflecting the light like stars. And the tiny baby fishies inside the roe are smiling brightly back up at the moon!
Picture this scene like it's a Disney cartoon. The good moon is smiling brightly down at the roe which are smiling right back. They might even start singing a song!