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Is there any reason why I shouldn't put seachem purigen in the top box of my fluval chi? (Beside it looking bad) Will it work properly in this location?
The key to any filtration media is that it is able to receive maximum water flow through it. For the most efficient filtration, we recommend placing filter media in the following order: mechanical (sponge, filter floss) --> chemical (Purigen, carbon) --> biological (Matrix)