There are $x$ fish in a fish tank.
They get fed the same fish food every day. They have varying opinions on the food.
One fish says he only likes fish food that starts with the letter A.
Another says he only likes fish food that ends with a vowel.
Yet another says he doesn't like food that those terrible humans would eat.
Finally, one says he only eats green substances.
The rest are too stubborn to say anything.
Can you figure out what food they all like?
Note- The food name doesn't really relate to any real fish food names and companies. Answer has to fit all requirements.