FILTER AQMEDIA
wow...
so many options..
here's my take.
the filter was designed to be a mechincal-chemical (in that order) syste.
mechanical purification generally comes first in the theory of filteration ( foam ) , then chemical (carbon/others), and finally biological.
Running carbon first in the filter generally clogs and slimes carbon quickly, hindering its capacity.
Foam removes heavy debris before it gets to the carbon.
Ammo rid should be last, but is not necessary unless the tank is newly established, over hualed, or while medication processes are happening.
Those that want the addition biological process can add biostars in the filter ontop of the carbon. A very course foam (after the carbon, can also act as a biological source.
IMPORTANT
It is best to rinse you filter media in tank water, or dechlorinated water while cleaning. Many people avoid cleaning the filter on the same day as the water change, however there are equal people that will debate it, whatever.
The bottom line is the purpose of a filter is to ...
clear the water of debris ( mechanical )
detoxify and remove excess nutrients ( chemical )
and provide nitrification ( biological )
and really...
the more stable the last one is, the less you'll need the other two.
Hope this helps
BTW...
Generally speaking, (based on product knowledge and a little inside info) Hagan Carbon and AmRid , under normal conditions, has a tank life of about 45 days.
This is somewhat based on absorbsion capacity and carbon quality.
Better grades and quaility of Carbon is available and is benefical. Check it out.
Exodon