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That would be a pod i believe. Perfectly harmless and good for your tank. Some fish like to eat em and they eat leftover tiny food. I;ve seen pods fight in my tank over a food pellet LOL.
There are numerous fish that eat them but you really want to keep them. lol You will notice as your tank ages that sometimes you will have a zillion and then in a week or two they will settle down in numbers. They are actually a good cleanup crew for small stuff. Get a flashlight at night when all the lights are out and you will see them going crazy all over the rock. lol I just cleaned out my filter sock last night and had a bunch of huge ones in there that got on my hand, they were creepy to feel on my skin. LOL But overall a good thing to have,