chemistry is different but even in FW
charcoal should be chagned out every month. Any longer than that and it starts to leach back into the water. I know the cannisters say 3 months, but it's just too long.
most recommend 1 week out the month for GAC
to AMMO chips. Ammonia and Nitrite need to be ZERO and if FO
then nitrates should be under 40-50.
I just got a 30gal to use as a QT
for an 8 week treatment. I'll be using a Aquacleaer 150 on that and changing the pads 2 or 3 times in that 8 week period. I'll be doing pwc
every day to stay on top of NH3