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The "scratches" look more like a dent than a scratch so I would have to say they were created by a fish more than an object. Since its on both fish, it's kinda hard to think that both fish could have found 1 sharp thing to bump into so it would be either an attack by the Gourami(s) or other fish or the 2 Angels sparring. Unless they get worse, happen more frequently or you see the fish actually getting hurt, I wouldn't do anything.