I've tried taking videos of it, because I can see it with my naked eye, but I can't get any of my cameras to focus in on it. They're extremely tiny specs moving about the glass. I don't seem to see them anywhere else throughout the tank (decorations, plants, etc.) and I don't see them free floating in the water. What a could this be and how did this get in my tank? The tank in question is a 3.5 gallon betta fish tank. Cycled, 0,0,20 - heated to 78 degrees. I recently exchanged the gravel in the tank for white sand and added some dwarf hair grass. I have driftwood soaking in a bucket waiting to be added, as well as java fern and anubius. I had a brine shrimp tank a few months ago that also had these same exact things in it - but they had no decor, substrate, or live plants. How are they getting in? Is it in my water??? My water conditioner maybe? And most importantly, is this harmful to my fish? I did a water change two days ago and scrubbed at the glass of the tank with a soft rag, I feel like I removed a lot of them but since I didn't feel comfortable doing a 100% water change, I couldn't remove them all. Help me!!!