Look to me like corydora eggs they always lay thier eggs on my amazon swords and that plant looks kinda like a sword so that is very possible but there should be more have a good look around your tank for more, Or the rest could of been eaten, Dont worry about saving this batch if you havent got a spare tank or breeding net If they are spawning they will spawn every 2 weeks or so belive me i keep corys great little fish. BTW a tank shot would be nice sounds like an intresting tank.