I have a Rena Canister filter and it is the best filter I have ever had. I have one for a 75 gallon tank, but using it for a 60 gallon. I just love it
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You don't need the Cerametic rings, or bio stars, they are an option. However, if you do get them, they will help your tank. I don't have them, and don't plan to get get them as of yet.
Joan was very helpful with pointing out many things about this filter for me before I purchased it
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The sponges come with the filter, and a carbon pad. After a few weeks the carbon pad wears down, but you don't want to go out and waste more money buying a whole new pad. Just buy a container of carbon, get a pair of panty-hose which costs so little, and use a bit of it to seal off some carbon and put it into the canister filter. This is what I am doing, this is what Joan does, and we both have success, it is great!
The Filter comes with a Priming kit, so you don't need to worry about sucking water through tubes or anything like that lol. I heard some stories on here about that with a Filstar brand canister filter.
Rena Canister filters also come with many cool parts, so that you can adjust the spray bar to the size that you want, and also adjust the speed of the water flow. I turn the spray bar up and back so that it sprays against the glass. It is a very powerful filter even on the lowest setting, so turning it like this baffles the flow greatly.
The filters are however pricey, but well worth it in the long run.
Here are some pictures I took when I first got it: