I've got green water culture already. I add it infrequently for luck, but perhaps I'll up the dosage and see what happens.
At the moment, one of the large worms has passed on. The rest are doing well, it seems. Daphnia, snails and gammarus are also breeding in there so hopefully there's a little bit of nutrient recycling occurring. I add bits of leaves, algae wafers and sometimes a little crumble food, too. But since it's only filtered by a little box full of gravel, I'm keeping feeding on the light side for the most part.