Apache58
Aquarium Advice Apprentice
OK well im pretty sure thats what those little guys are called, the little creatures you can barely see that are swimming around in there. I just added a few snails and crabs and two sand sifting stars to my tank and with it the water they came in from my LFS. there was a lot of them at first but since my first water change a lot have dissapeared which seems unavoidable but how fast do these things repopulate, am i slowly eliminating them with water changes? and lastly what advantages do they have within a tank?