It’s important to note the plants in the wall aren’t going to get everything they need from the fish. From this I’m going to extrapolate that the fish aren’t getting everything they need from the fish food.
If you look at the two leaves in the picture, you’ll see one is chlorotic (showing insufficient chlorophyll from deficiencies in nutrition aka splotchy color). The leaf on the right, the chlorotic one, is the older leaf. The leaf on the left is healthy with a much more even distribution of chlorophyll. The leaf on the left is new, appearing after I sprayed the wall with worm casting tea.
So I extrapolate . . . if the plants are getting incomplete nutrition from the fish, the fish are getting incomplete nutrition from the food they are eating.