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White bubble-like things, with white dots in them. They've been around for a bit, spreading, getting a bit bigger. Eggs? Algae? (not really green, the photo makes it appear a bit green).
Many thanks! I suppose there is no easy way to get rid of them of course! I have suddenly some caterpillar algae as well, so I must be doing something to cause the conditions for this. Will search to see if I can find what's going on.