I noticed these tiny specs last night. They are most definitely organisms as I can see them moving in way that is not caused by the water current. I have not introduced anything new to my tank since my Apple snail (1 month ago) and I keep the water in tip top condition. I have been reading every post I can find but still no definitive answer has arisen. The only link I have found is that perhaps I have left some uneaten algae wafers, (snail food) at the bottom. But where do these little guys come from? I have a nice mp4 video but cannot figure out how to attach it. It is 62MB and I zipped it but get an error when uploading. Thank you.