Hello to everyone! I'm new to the forum and it has been almost more than 6 months I set up my two 4.8 gallon betta tanks. So far things have been going smoothly, learning new things everyday. Yesterday out of curiosity I grabbed a flashlight to check how things are in my oldest tank. To my surprise I saw a few tiny little things moving in a weird manner on the glass of the aquarium. This video is not mine as they are too quick to capture. Are they dangerous for my betta and my ecosystem in general? Is there a way to remove them if they are dangerous? Thanks in advance! I forgot to mention that their number in my tank is way way less than this video's. Still they kinda made me panic. Here's a photo of my tank too. Anyone help?