about three weeks ago i bought 3 cories from my lfs and some flourite and gravel to make my tank heavily planted...and my cories were in my tank and i am adding my flourite right?(i was careful). later that night the water cleared and i saw 30 eggs right on the glass. unfourtanatly the eggs were not fertal so i bought 3 more cories and i cannot seem to stimulate them to lay eggs. any advise? :help: