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If clear and small, I'd say BB sized or so, then they are probably just mucus-substance lined bubbles that sometimes form in reef aquariums. You can use a powerhead to blow water on them to get them to move, if they don't move they might be tiny bubble algae, but most of the time bubble algae is green,brown, or purple, even when very small.I have some clear bubbles. Could that be some type of bubble algae? Or just bubbles?