I say you might have Tetra eggs then. They are egg layers. They also like to scatter them around like that, on plants rocks etc, any place they can stick them to. Usually they will put them in places they feel are hidden some. So you might be having baby fish soon. If you do, move them out of the tank to a different one, after they are born so they don't become dinner for your fish. That is if you want to keep them.