I run 2 emp 400 and a cascade 1000 on my 75 and I have to clean nothing for months and that was even when I was way over stocked too. I rinse my emp 400 every 3 months. Never have and water problems. But I do 50% water changes every week. I also run a large sponge filter too. Way above over kill for a 75 and I love it. I would run the setup for my 150 with no doubt it would have the same results for a larger tank
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