This is 1 thing that I really think is obvious, whether my aliens should grow algae or fruits and vegetables. But here are the pros and cons: Algae Pros: low maintenance for hydroponics Cons: Aliens don't eat algae Most humans would be grossed out just from seeing algae Very few if any humans would like the taste of algae(in fact it wouldn't surprise me if most humans got nauseous after eating algae) Algae production would not be stable(blooms followed by massive die-outs) Algae do not produce flowers so the bees wouldn't have anything to pollinate Fruits and Vegetables Pros: Humans love it as do aliens Soil is overall easier to maintain than hydroponics. Mixing compost with regular soil is about all you have to do to keep the soil nutrient rich. There is 1 species of earthworm that survives on anything that can be decomposed, even human and carnivore poop. It would benefit the bees in the aviary Cons: I don't really know of any So I think it is obvious that they should grow fruits and vegetables because the bees having something to pollinate far outweighs the difficulties of growing algae and the fact that both humans and aliens love fruits and vegetables far outweighs the grossness of algae. But what do you think?