Personally, depending on fish type, I would use 2 50's. That way you have water flow on two sides of the aquarium. Food for thought: If there is a chance that you may move up to a 75gal or 100gal tank in the future I would get 2 70's. You can always adjust the water flow if the 70's are too powerful for your 55gal tank or fish type.
answered 2 years, 6 months ago
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the Biggest Casccade is only 265 and hour flow rate and general rule especially with aquarium you want to move your water 10 times an hour so you would need to filter 550 and hour so you will need more than one filter. You could use the Rena XP2 or 3 along with the cascade 1000 or cascade 700 I currently have a 65 gallon Reef and use the Rena XP2 and the Cascade 700 wiht a Reef Octopus BH-1000 protien skimmer puuting my water flow at 735 GPH. Hope this Helps
answered 2 years, 7 months ago
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