My current setup is a 55 gallon tank with three Oranda and one Ranchu. Filtration is three sponge filters + a canister filter rated for 75 gallons (265 GPH). If I add
AAP, SeaChem Tidal High Capacity Aquarium HOB Power Filter
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Seachem - Tidal 55
5 Best Filters For 55-Gallon Tanks: Our Top Recommendations
The Best Filter for 55 Gallon Aquarium in 2022 - Aquatic Eden
U1 Underwater Filter, up to 15 US Gal / 55 L - Fluval USA
Auray PFSS-55 Pop Filter with Gooseneck PFSS-55 B&H Photo Video