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It is bubble algae if you pop the silver balls the spores will spread all over the tank try and siphon it out without popping it. Good youtube videos on removing it check it out!
Ive had red bubble agae before that had red specs in them with atinics only on. Ive had a little if the green. Ive always just removed it carefully from the base without popping it. I use a small pair if tweezers.