How To Change Filters Without Destroying My Cycle?

leannajayde

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I currently have a Marineland HOB filter ment for up to 20 gallons and a sponge filter meant for 20-30.
I have a 20g long but want to upgrade my HOB to one that can handle up to 30 gallons just to have better filtration.
My current HOB only has a cartridge filter floss thing and a bio wheel.
I know everyone always advises to use old filter media in a new filter but how would I transfer old filter media that's ment for a smaller filter into a larger one???
 

Fahn

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Just stick the new cartridge behind one of the bigger ones, problem solved.

To never replace cartridges, put a sponge cover over your filter's intake and throw biomedia in the filter compartment along with the current cartridge. Wait about a month and you can toss the cartridge forever, all you'd need to do is wring out the intake sponge once a week. The biomedia will never need to be replaced.
 

DuaneV

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What Thunder said. Put the old filter right on the new tank, run the new filter too. After 4-6 weeks take the old filter off..... OR just put the old filters media in the new filter. Problem solved.
 
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leannajayde

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Im not changing tanks just wanting more filtration. I thought about running both at the same time until the new one builds some gb. Won't running both create too much current and bother my fish though?
 

pugletfan

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You can put a piece of coarse filter sponge on the outflow (waterfall part) of one of your filters to baffle the flow. I use a rubber band to hold it in place. This way you can run two filters but still have an area calm water.
 

Thunder_o_b

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Im not changing tanks just wanting more filtration. I thought about running both at the same time until the new one builds some gb. Won't running both create too much current and bother my fish though?
I run 700 GPH filtration on our 37 gallon guppy aquarium and they are fine. HOB and canister.
 
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