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Upgrading hob from aquaclear 50 to 70 question

swoons

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I'm upgrading my hob filter to a little larger one but I am wondering how I go about the transition. Should I just put the brand new hob filter on and take off the old one or do I see the new one? do I run them side by side until the new one's media is cycled?

Any suggestions or methods you think would be best let me know! Thanks!
 

Peace River

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What size is the tank? How much live rock do you have in the tank? What type and how much media do you have in the HOB? How much bio-load is in the system (number of fish, etc.)? If all of your biological media is in the HOB then you may need to run in tandem for a bit, but if you have a good bit of live rock then it becomes less important.
 

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