Help with filtration

Yes. To quantify my answer, it depends on which canister and how much rock. Also, the canister must be kept clean.
 
I'd say yes.. Other questions would be, how large is your tank?
I realized that I don't really have any form of filtration over the past few years except for a 4" sand bed and lots of live rock (that was previous dried out).
You might be cleaning out the canister filter quite often, may become a hassel after a while. just something to think about but it is do able. I previously used a canister filter on a reef just fine but cleaning it was the pits.
 
Its a 55 gallon with 70 lbs live rock and 70 lbs of sand. I have been running just the Rena xP2 canister for the two months it has been set up, but have been debating getting a HOB protein skimmer. And money is tight so not sure if I will.
How often should I be cleaning out the filter?
 
Also depends on what's in the tank (livestock) and how often you feed. What are you running in the canister?

But I think what you really want to know is if you can run the tank skimmerless and still have success. To answer that question, I say yes, you certainly can... you just need to be a little more careful to avoid overstocking/overfeeding and be sure to keep up on water testing, water changes, etc.
 
Its a 55 gallon with 70 lbs live rock and 70 lbs of sand. I have been running just the Rena xP2 canister for the two months it has been set up, but have been debating getting a HOB protein skimmer. And money is tight so not sure if I will.
How often should I be cleaning out the filter?

At least every 2 weeks.
 
I would cut the rock down to 40-50 lbs just to free up some space for fish to swim and corals to grow. All you really need is live rock a good skimmer and water movement to run a reef, its called the Berlin method. I have no real form of filtration on my tank. I have a good skimmer, sump with fuge area, shallow sand bed, around 40 lbs of live rock, reactor with carbon and I will fun a filter sock over my sump drain some times. I would call my set up more of a water treatment than a filter. My rock also has many different sponges that have grown that help filter the water.
 
I would not use a canister for biological filtration. Live rock should be adequate. Canisters are good for running carbon, however, with the caveat mention by the others to keep the interior clean. Changing carbon every two weeks is usually enough.
 
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