I just found a few teeny tiny white shrimp-looking critters in one of my tanks. I know they're some kind of "pod" and the bit of research I did suggests that they're amphipods (just based on the shrimp-like look), but the almighty Wikipedia tells me that most amphipods are saltwater. I know 'pods are generally considered harmless and good food for fishies, so I'm not worried, but I'm curious of freshwater amphipods are actually a rarity or if I'm misunderstanding the Wiki article. Anybody?