barnesy

Hi team I’ve been growing up a bunch of juvenile Oscar’s to try find a pair. I now have 6 x 25cm+ 3 year old Oscar’s. 2 are in their own 6x2x2 and have laid eggs 8 times recently and each batch has spoiled. It looks like a fungus or something. I left the parents in with the eggs 7 times and this last time I removed the eggs and slate and put in them in a tank with Methaline blue. They still spoiled. What could be the reasons? Infertile fish? 2 females? Poor water quality? Any advice from the experts would be awesome. thanks