Thanks Lindsey! Actually, my feeding has been kind of sporadic.
I do occasionally spray some weak fert., but mostly I just soak them at least once, maybe twice a month, in a 5 gal. bucket filled with a half, to a three quarter strength fertilizer solution.
I let them each soak for about 30-45 minutes each time. That's probably not the right way to do it, but it seems to be working for me. They do seem to be happy!