Looks like cysts to me... you may want to treat cause that shit is in whole tank by now. To confirm it's cyst, check ifbhe is trying to rub against plants or decor, like its itchy. If yes, sorry
this post was submitted on 20 Mar 2024
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Also, checking the amount of debris on your picture, it seems you are not doing cleaning enough, which is a source for itch bacteria. My usage in this case is one 30% water change per week until it stabilizes, then once every 2 week, depending on your filter. Be careful with the water changes if you decide to treat.