ch wrote:

Hello,

my filter is dimensioned that about one tank content pass it in one
hour. I heard this is good for the bacteria culture which lives in it.


The filter we currently have, for which I can't find replacement filter
cartridges anymore, is sized for "up to a 75 gal tank" and it moves about
300 gal/hour. I have a 55 gal tank and the circulation seems fine. A
circulation of 55 gal/hour seems very slow, but maybe it is fine, too.

dwhite