The Planted Tank Forum - View Single Post - seachem matrix bio best ?
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Old 01-31-2013, 03:27 PM   #15
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Originally Posted by CrypticLifeStyle View Post
anaerobic problems. It needs a richer source of oxygen which it's not going to get inside the tank or in the substrate. Yeah matrix is pumice stone. Old volcanic rock.
Thanks - I'll stick to putting it behind my Mattenfilters.

Any opinions on what is better - pumice stone or lava rock? I would think the lava rock, having larger "pores", would collect mulm & detritus more easily. But lava rock leaches iron (desirable to me) into the water as I understand it, so I would still use it to tie my anubias and java ferns to (or perhaps it contains iron that the roots can access - I can't remember).

So I will put pumice stone in the filters, and lava rock attached to water column feeding plants. Sounds good?
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