Walstad low-tech 40 B, central FL biotope, creator of Jordanella floridae x Mobula birostris hybrid
I found tons of these on the water lettuce I used to have. It inexplicably got yucky and wilted, and when I removed it I discovered tiny green bugs all over the leaves. So I bet that the aphids did them in, at least in part. (Ironically, we have tons of ladybugs living in the shrubs just outside, maybe the aphids fled to the aquarium to escape the carnage? 😁 ) Now I'm annoyed with myself for not thinking to feed them to the fish. If there's a next time, though... those aphids will become part of the circle of natural aquarium life for sure!