i was wondering if anyone could help with this question... (not exactly gardening) i have an outdoor fish pond (about 2mx1m and ~30cm deep) with uncountable goldfish (~50). i feed them fish flakes every day but want to let the system take care of itself. there are reeds, papyrus, lotus and a local weed that carpets the water surface (great mulch when i get around to clearing it out a bit). anyone know what fish eat when they aren't eating that coloured factory food? or am i pampering them? they are supposed to be eating mosquito larvae, but the mossies are too smart and mostly breed elsewhere! they always finish what i feed them in a few minutes, so i get the impression they need it. any thoughts on the topic most appreciated!