I have this pack in my 3.5 year old 14 gallon bio cube and it works great. All water parameters normalize. Initially I used these packs regularly during the setup and start-up of my new aquarium because this pack really helped keep the water parameters down (along with regular water changes and a good filtration system). Now my tank is fully charged and I do little other than regular water changes to keep the system where it needs to be (I've learned not to fiddle with the tank any more than necessary). However, I recommend these filters and find them. cost more locally, so I prefer to order here if necessary.
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