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Sponges and where to get them.
I'm thinking of maybe sticking a few sponges in my sump area to add some more natural filtration. I'm looking for low/no light types that are fairly hardy. Is it practical to even do this, or is the amount I'll need way beyong what would be reasonable to put in a system? (I have a 125 display with a megaflow 4 sump)
I've searched google and cant even find a place to by them, but I remember a link on here a while back for a site that had alot of different types.
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