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Discussion Starter · #1 ·
I have a 55 gallon (overstocked). I run an Aqua Clear 70, Fluval C4, Seachem Tidal 75, and a Fluval U3. I use sponges, Filter floss, matrix, biomax and an 11.74 ounce bag of Chemi-pure elite. The Aqua Clear 70 and Fluval C4 have Filter Max prefilters. All my water perimeters are perfect and the tank is crystal clear. I purchased all of them except the Aqua Clear out of curiosity.

I love the Aqua Clear and the C4.

The Tidal 75; Works well, but requires to much maintenance. If you don't clean it once a week, you get to much by-pass. The odd shape of the filter basket makes cutting sponges difficult. The media basket is huge, but if you fill it more than 3/4 full, you either have to turn the flow down to approximately 50% or live with the by pass.

The Fluval U3; not really sure what to think. I guess it works, but it really doesn't seem to get dirty and the flow isn't very strong. I left it stock and i imagine the biological media is helping. Not sure I would buy another. Yes it is to small for my 55, I just wanted to test one. I imagine they all work at some level, but the Aqua Clear and Fluval C4 are the best in my opinion. I would much prefer a canister, but the tank location doesn't allow it. This set up will make cycling a new 55 we are soon to purchase much easier.
 

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The Aquaclear is the best HOB filter on the market as far as I'm concerned. The Tidal 75, I am not familiar with, but there is nothing wrong with running it at 50%. Matter of fact it may clean even more. I have the Fluval FX5's, and only because 1 was given to me, and the other was the closet you can get to be free. I am one of the biggest fans of Eheims classic line, and I think a 2217 would do very well on that tank. You would also have a longer cleaning interval.
 

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Discussion Starter · #3 ·
I agree, but a canister is not in the cards because of where the tank is located. It sits on a built in book case. I haven't decided on which canisters we will use when we set up a discus tank in the next few months. Will research that to death.
 

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Also if you go with another HOB filter get the larger AquaClear 110, you can always turn it down some.
 
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