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Custom Biomaster

I’m finding that, despite a filter on the intake, I still have muck in the pre filter. Admittedly, my intake isn’t 40ppi, more like 20ppm. I’ve left them anyway as they add biological filter capacity.
 
I’m sure they do add some extra biomedia capacity but I don’t think I need it on my Nano, I have more than enough in the canister trays.
 
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