Duckweed works better for animal feed since it produces far more biomass and protein per day although azola is still pretty good. Thx problem with both is dewatering and getting high enough consumption. It works as an additive but certain animals don’t like to eat pure azola or duckweed. Processing it into protein concentrate helps out though so you can feed far more to animals that would otherwise start refusing rations made with too much of either.

One thing worth thinking of would be a cooling jacket on the back of the solar panels that also heats the pond water. That makes the panel’s more efficient, only needs a small electric pump to circulate it, and makes the pond plants grow faster when it’s cold or even allowing them to be productive in the winter in certain places?