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Well if your shutting down your 22g I would use the old filter on your new tank and add a second filter that can run the 55 on its own.
For two reasons,
For one, your old filter will be loaded in bacteria that will help seed your new tank, while your new filter establishes.
For two, having two filters in a tank is peace of mind for backup in case one dies. I run two filters on all my tanks, and either could run the tank on their own if need be, I run them both throttled back a bit, and if one died I just up the flow on the other and add a new filter to replace the dead one, while the good one sustains my cycle. And also for maintenance, I have three floss bags in my two filters, one has a chamber for one, the other has dual sides. So what I do, is clean one in my extracted tank water each week, and put it back in. I rotate to a different one each week. So they have staggered degrees of bacteria on them. And when I have to change one out, I stagger that as well, so I always have two well used chambers and any given time. That way I never go through any mini cycles, my water is and filters stays cycled, mature and clean.
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