i was given a can of it and use it in my FX5. that stuff is NOT cheap.
I also use lava rock in the same filter. That has a TON of surface area. I like using it.
If the Martix wasnt given to me i would have NEVR paid for it.
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There are 2 types of people on this forum. Those that have algae, and those that lie and say they don't.
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