Yeah, I don't think grass shrimp are gonna hurt a pond's food chain. They are detrivores as Bill said. I have kept them in tanks with the smallest of fish and have never seen them attack them. They are rather skittish, I would be too if I was that low on the food chain! They are not zooplankton feeders like many of the fish species that we place in our ponds for food chain building. This means there is no competition with BG, RES or young LMB for the limited supply of zooplankton. The larvae of grass shrimp do feed on very small zooplankton, but they themselves are larger zooplankton, so they probably benefit the pond by converting the very small zooplankton into larger zooplankton that BG, LMB etc would be more apt to feed on.
