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I have just recently noticed very small white spots on some plants and the glass. I scraped them off the glass and they came back a day later. Anyone know what this is.
If it's like tiny clear balls with white dots in them it's snail eggs. If it's not really white but more greenish - it's algae. But I bet they are snail eggs!
If they are wavy like (maybe looks like an anemone), could be freshwater hydra. If you do a google search, you might be able to find a link to a picture.
If the spots appeared very quickly, and in high numbers again, this is likely your problem, IMHO.