Cyprinids and Atherinids
In the long 20 gal tank I keep at my parents' house, I have a Black Moor and a Fancy Goldfish(*) (plus 4 small comets). Both are about a year old, and are pretty happy and healthy for the most part. However, when I last went home, Cody (the gold), was making what seemed to be, I kid you not, a...