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It looks like the Eheim Substrate pro but cost much less. I've seen people mention it, but has anyone actually tried it?
 

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They look similar but are two totally different materials. Eheims Pro media is suppose to have like 10 times the surface area making it superior to a lava rock. Im not saying it would work and prob would have considered it if my eheim didnt come with the media, but am just saying.
 
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