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Are hank on back filters good? I mean if I have a 40L tank and I use a HOB filter that is 450 L/h will this satisfy my distribution needs or are they not preferable?
for low tech tanks HOBs are great as the outlet provides as high gas exchange. I have a 200L/h one in my 28L nano and it provides nice steady circulation all over the tank. They'll probably do for a hightech tank as well, better than an internal maybe not as good as a canister. The biggest pro they have over canister filters is probably cost.
Hi
if you are injecting CO2, the extra aeration provided by a HOB filter might not be a good idea as it will drive CO2 out of the water at a higher rate
eheim has some very nice external filters for nano tanks, some chinese manufacturers as well
I have a HOB on my 40 liter tank ( http://www.ukaps.org/forum/threads/dong-hu-gorge.29582/page-2 ) and it does the job ...I modified it a bit by taking out the filters which come with it and just put some floss where the water comes into the filter and put some noodles on the bottom.
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