what to put in a HOB filter?

I just got a HOB filter, what should i put/take out of it???
Carbon?
Phosphate?
what else?
do i leave the carbon in w/out taking it out?
and do i slowly add phospates in and out?
 

clown_nut

Member
Generaly Carbon is used mainly when your water begins to let off some nasty odors or tank on yellowish appearances...Most agrea that Carbon only lasts a few days and If left in the filter too long may begin to leach all the toxins it absorbed back into the water...You may Want to Run your Carbon just 3-5 days at a time perhaps once a month or more so if needed.
 
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