Okay...this is happening in my 10g RCS tank but you guys are my peeps so I'm asking you for your help! This morning I was checking in on my RCS tank and noticed hundreds of little white things (like...almost microscopic?) floating/swimming around my tank and climbing up the sides. They are just little white circles (like the size of a pinhead) but they move around. I have NO idea what they are. I don't think they're little shrimp because they come out looking like real shrimp! What is in my tank? Is it dangerous? How did it get there? How does it go away? Water was tested ... everything is normal. I do weekly water changes on all of my tanks. HELP!