whats its "rated" for is just a marketing ploy. what you need...MINIMUM is 5g/hour being cycled through. generally, it's a good idea to do better than that, and i certainly don't think it's enough. i suggest a minimum of 8g/hour; some on AC would suggest 10! it's part personal preference, part due to stocking levels, etc.
on my 50g, i use an emperor 400 and i accent this with a small duetto internal filter, so i'm getting around 10g/hour. that tanks bioload is very high, so i do a lot of water changes despite this filtration.
i'd recommend using an emperor 400, it's the best HOB filter i've used, far more reliable than aquaclear in my experience. $40 at bigalsonline.com. alternatively, using (2) AC 200s won't hurt you, i've just found these unreliable. on AC 300 gets you 6g/hour turnover. i'd recommend increasing this unless you're setting up a low population planted tank or something.
my top 3 filters:
EMPERORS
AQUACLEARS
PENGUINS
i only use HOB and internal filters. the modular eheim aquaballs are pretty cool, as well...as second filters, or for using in fry tanks.
on my 50g, i use an emperor 400 and i accent this with a small duetto internal filter, so i'm getting around 10g/hour. that tanks bioload is very high, so i do a lot of water changes despite this filtration.
i'd recommend using an emperor 400, it's the best HOB filter i've used, far more reliable than aquaclear in my experience. $40 at bigalsonline.com. alternatively, using (2) AC 200s won't hurt you, i've just found these unreliable. on AC 300 gets you 6g/hour turnover. i'd recommend increasing this unless you're setting up a low population planted tank or something.
my top 3 filters:
EMPERORS
AQUACLEARS
PENGUINS
i only use HOB and internal filters. the modular eheim aquaballs are pretty cool, as well...as second filters, or for using in fry tanks.