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A 75g is a tough road for two oscars believe me I've been down it when my pair would spawn I would transfer them into one, between possible aggression issues and water quality it take a big commitment. I used 2 Fluval 405's with a 60% water change every 4 days to keep up...it's do able just slot of work.
I didn't ignore it. I said in this tank. When I move them to a bigger tank I will seperate them. No one likes people that try to start stuff over the internet.