Just today I noticed excessive sand swirling around in my tank so I decided to take a closer look. I first saw these creatures on my 7 inch Oscar. They appear dark green or brown in color and very small (about the size of a grain of sand). However, they move around on him! You can see them on the Clown Knife as well and the driftwood in clusters (what I thought was the sand earlier were these creatures swimming around). I don't know what this is, but it can't be good and I want it out of my tank. Any ideas on what it could be and/or how to get rid of it? Maybe some sort of parasite?