I do have a pond and I brought some of that water in. It is light green but what, other than hay, can I put in it to get it going? "vegetable matter"? as in lettuce?
I would do a water change every day and dump pond water in. I would also put the brightest light I could in the aquarium to try to stimulate green water in there. I am not sure how big the fry are now, but I like to do that for all small fry (go for the green water).
You could probably use just about any organic vegetable to stimulate the green water, I would be careful about stuff that was sprayed though. I can not remember my orginal post, but the intent was that you could set up a rubbermaid tote or bucket with some hay to get some insoforia going..