So I was performing my regular weekly water change and disturbed some of the substrate and thought I had kicked up some random poop but this was too small to be poop. They were just floating around so I thought nothing of it but then one of them wiggled its tail (!!!!!!). It was about a quarter of inch long and white ish in color but not completely opaque. Most were just floating some definitely were moving. What should I do?? Couldnt get a clear picture but Im terrified of stirring up the sand again to get them back up. This is the first water change of this new tank so not sure how long they have been there but I am thinking it could have come from some anacharis I plucked out of a local pond. I did a bleach dip so I thought I was safe but maybe not. I can't think of anything else that would have introduced them to the tank. My equipment is now soaking in a bleach dip but how do I treat the tank? Thanks in advance!