I change the carbon in my filter bi-weekly. Is this too often if I have a small fish load?
No, it is better (and easier) to prevent odors versus having to remove them once they've accumulated. Some fish are messy eaters, or are more prone to producing large amounts of waste, so prevention is key.
Does Fluval carbon filter media remove the liquid plant fertilizer I apply to my aquarium?
Carbon, especially when new, can remove some trace elements present in many liquid plant supplements. We recommend waiting at least a week or two after having changed the carbon before you apply a liquid plant supplement.
What material is Fluval Activated Carbon made from?
Fluval Carbon is made from bituminous coal, which is the best overall source material for carbon used for aquarium water filtration due to its varying pore structure and sizing.