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Picture's not really clear enough for a pos. Identification but I'd be willing to say they are snail eggs. The Tetras scatter thei eggs, the Harliquins don;t usually put that many eggs in one spot, The gouramis would put their eggs in a bubble nest. Not sure what a "sae" (type in english please, not text ) is and the cory would be somewhat of a scattered pattern as well. By a process of elimination, it's one of your snail's eggs.
Hope this helps