I have a breeding pair of tiger snakeskin discus and they have spawned 3 times now but the male isnt fertilising the eggs and the eggs dont become anything. The conditions in my 6ft tank are fine and i have a aqua one aquis 2700 lh filter system. I do regular water changes each week usually 30% and they are housed with 4 L002 5 guppies and 20 tetras so why isnt he fertilising the eggs he is interested in them but yet to make them fertile whyis this so i do know it will take a while but i need some advise?