I am considering building a sump filter for my freshwater aquarium. I need some input on the best types of filtration media. Which is the best or combination of medias? I think the obvious answer is Bio-Balls, but do i need any addition media? Maybe charcoal or a sand media. Also what order should the media be arranged? Should the Bio-Balls go before the charcoal or visversa?
Thanks,
Eric
Thanks,
Eric