not sure whether "internal" + "canister" should be put together. Anyway I did it. I don't have a chance to use the old filter material coz my tank is filterless before but not easy to manage. I use new filter material in the new canister with a capsule of "cycle" everyday. change water once a week. luckily, all the fish survive and don't have algae boom. The smell is no good on the first couple days, but after around 2 wks I guess everything settle coz NO3 was rising and no NO2 detected. I use over the recommended volume of bio-rings in my P10. all together 1 litre for my 16-18L water.
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