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Old 04-19-2021, 12:57 AM   #1
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FX4 vs Sun Sun HW-704b

I'm currently running the Sun Sun HW 704b canister filter on my 115-gallon tank. I was thinking about buying an additional filter to add with the Sun Sun but My wife bought me a gift FX4 canister that does 250 gallons.

Do you think the fx4 is an upgrade?

If so what's the best way to switch filters Without shocking my tank.
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Old 04-20-2021, 12:01 AM   #2
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Hello, fx4 is about 700gph, the 704b is 525gph. The fx can handle 150gal comfortably. The sunsun can a 100gal. This is going by the standard of a canister filter handling 4-5x water volume of tank an hr.
So if wanting to run the fx on tank I would move all media including sponges & floss from sunsun to fx & run this way for a while. Once tank is reestablished then slowly replace to media of choice.
You may lose some bacteria during this process so I also suggest you test for ammonia & nitrite during the next few weeks just to be safe. Hopefully this helps!!!!!
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Originally Posted by davidwolf View Post
I'm currently running the Sun Sun HW 704b canister filter on my 115-gallon tank. I was thinking about buying an additional filter to add with the Sun Sun but My wife bought me a gift FX4 canister that dose 250 gallons.

Do you think the fx4 is an upgrade?

If so what's the best way to switch filters Without shocking my tank.
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Old 04-22-2021, 10:31 PM   #3
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If you can, squeeze them in and run them together, taking some of the filter pad squeezings and cycled media and add into the new media.
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