Have a 46 gallon bow front with 9 cichlids, 4 inches or less. My current filters are an Emperor 280 that has run nonstop and without issues for ten years and an Aquaclear 50 that is fairly new. My water parameters stay at Ammonia 0, Nitrite 0, and Nitrates 10-20. This is with at least 30% PWC per week. I am considering taking off the Emperor and getting a second Aquaclear. Reasons? Age of the filter and the Aquaclear seems quieter. Should I do this? Can I do it without a mini cycle? I do have bio rings in the plastic cartridge of the Emperor, which could go in the new Aquaclear.