Originally Posted by brothergc
I just started to set up a new aquarium , it is a 29 gallon . I am thinking of using 2 fluval C4 filters and turning them down to slow , question is this over kill ? I know that these are rated for much larger tanks
I originally had one C3 on my 29 gallon and it kept the water crystal clear and polished on "full speed" but I had to replace my cut to fit 100 micron pads often. I moved the C3 to another tank and installed one C4 and the filter media lasts much longer. I run it at about one third power and it works fine. When I run it at full blast, it's way too much current for my angel fish as well as others in the tank.
Two C4's at minimum speed will still probably create a "rip current" in a 29 gallon tank. The C4 flow rate can be adjusted from 159-264 gph
according to the owners manual. So with two, you are going to have 318 gph
which is way more than I would think you want or need and even more than the recommended 6-10x gph
typically recommended for HOB
's in this forum. The C series Fluvals operate as hybrid canisters so you need less flow than most HOB
Also, my two C3's on my 38 gallon as well is my C4 on my 29 gallon start making some noise at the very minimum flow speed. They are all essentially silent at higher speeds.
Suggestion: Start out with one C4. You can always add more filtration later.
You might be interested in my post #29 here: